Mental Math

Question 1

Time to travel 1 C at Speed of 3 Kts

Answer 1

120 seconds

Question 2

Time to travel 1 C at Speed of 5 Kts

Answer 2

72 seconds

Question 3

Time to travel 1 C at Speed of 6 Kts

Answer 3

60 seconds

Question 4

Time to travel 1 C at Speed of 7 kts

Answer 4

51 seconds

Question 5

Time to travel 1 C at Speed of 8 Kts

Answer 5

45 seconds

Question 6

Time to travel 1 C at Speed of 9 Kts

Answer 6

40 seconds

Question 7

Time to travel 1 C at Speed of 10 Kts

Answer 7

36 seconds

Question 8

Time to travel 1 C at Speed of 11 Kts

Answer 8

33 seconds

Question 9

Time to travel 1 C at Speed of 12 Kts

Answer 9

30 seconds

Question 10

Time to travel 1C at Speed of 13 Kts

Answer 10

28 seconds

Question 11

Time to travel 1 C at Speed of 14 Kts

Answer 11

26 seconds

Question 12

Time to travel 1 C at Speed of 15 Kts

Answer 12

24 seconds

Question 13

Time to travel 1 C at Speed of 18 Kts

Answer 13

20 seconds

Question 14

Time to travel 1 C at Speed of 20 Kts

Answer 14

18 seconds

Question 15

Time to travel 1 NM at Speed of 3 Kts

Answer 15

20 minutes

Question 16

Time to travel 1 NM at Speed of 4 Kts

Answer 16

15 minutes

Question 17

Time to travel 1 NM at Speed of 5 Kts

Answer 17

12 minutes

Question 18

Time to travel 1 NM at Speed of 6 Kts

Answer 18

10 minutes

Question 19

Time to travel 1 NM at Speed of 7 Kts

Answer 19

8.5 minutes

Question 20

Time to travel 1 NM at Speed of 8 Kts

Answer 20

7.5 minutes

Question 21

Time to travel 1 NM at Speed of 9 Kts

Answer 21

6.67 minutes

Question 22

Time to travel 1 NM at Speed of 10 Kts

Answer 22

6 minutes

Question 23

Time to travel 1 NM at Speed of 11 Kts

Answer 23

5.5 minutes

Question 24

Time to travel 1 NM at Speed of 12 Kts

Answer 24

5 minutes

Question 25

Time to travel 1 NM at Speed of 15 Kts

Answer 25

4 minutes

Question 26

Time to travel 1 NM at Speed of 18 Kts

Answer 26

3.33 minutes

Question 27

Time to travel 1 NM at Speed of 20 Kts

Answer 27

3 minutes

Question 28

Answer 28

SIN(θ) = CPA / DIST = 1 C / 10 C = 1/10 (6) = 1/10 **Steer in/out 6 Degrees**

Question 29

Answer 29

SIN(θ) = CPA / DIST = 2 C / 10 C = 1/5 (12) = 1/5 **Steer in/out 12 Degrees**

Question 30

Answer 30

SIN(θ) = CPA / DIST = 5 C / 10 C = 1/2 (30) = 1/2 **Steer in/out 30 Degrees**

Question 31

Answer 31

SIN(θ) = CPA / DIST = 1 C / 20 C = 1/20 (3) = 1/20 **Steer in/out 3 Degrees**

Question 32

Answer 32

SIN(θ) = CPA / DIST = 2 C / 20 C = 1/10 (6) = 1/10 **Steer in/out 6 Degrees**

Question 33

Answer 33

SIN(θ) = CPA / DIST = 5 C / 20 C = 1/4 (15) = 1/4 **Steer in/out 15 Degrees**

Question 34

Answer 34

SIN(θ) = CPA / DIST = 1 NM / 2 NM = 1/2 (30) = 1/2 **Steer in/out 30 Degrees**

Question 35

Answer 35

SIN(θ) = CPA / DIST = 1 C / 30 C = 1/30 (2) = 1/30 **Steer in/out 2 Degrees**

Question 36

Answer 36

SIN(θ) = CPA / DIST = 2 C / 30 C = 1/15 (4) = 1/15 **Steer in/out 4 Degrees**

Question 37

Answer 37

SIN(θ) = CPA / DIST = 5 C / 30 C = 1/6 (10) = 1/6 **Steer in/out 10 Degrees**

Question 38

Answer 38

SIN(θ) = CPA / DIST = 1 NM / 3 NM = 1/3 (20) = 1/3 **Steer in/out 20 Degrees**

Question 39

Answer 39

SIN(θ) = CPA / DIST = 2 C / 40 C = 1/20 (3) = 1/20 **Steer in/out 3 Degrees**

Question 40

Answer 40

SIN(θ) = CPA / DIST = 5 C / 40 C = 1/8 (8) = 1/8 **Steer in/out 8 Degrees**

Question 41

Answer 41

SIN(θ) = CPA / DIST = 1 NM / 4 NM = 1/4 (15) = 1/4 **Steer in/out 15 Degrees**

Question 42

Answer 42

SIN(θ) = CPA / DIST = 2 NM / 4 NM = 1/2 (30) = 1/2 **Steer in/out 30 Degrees**

Question 43

Answer 43

SIN(θ) = CPA / DIST = 5 C / 50 C = 1/10 (6) = 1/10 **Steer in/out 6 Degrees**

Question 44

Answer 44

SIN(θ) = CPA / DIST = 1 NM / 5 NM = 1/5 (12) = 1/5 **Steer in/out 12 Degrees**

Question 45

Answer 45

SIN(θ) = CPA / DIST = 2 NM / 5 NM = 2/5 = 0.4 (1/2.5) SIN(20) = 1/3 SIN(θ) = 1/2.5 SIN(30) = 1/2 (25) = 1/2.5 **Steer in/out 25 Degrees**

Question 46

Leadmark bears 3° high at 1 NM

Answer 46

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3 = 3° x 1 / 3 = 3 / 3 = 1 Port of Track (SM would be Starboard of Track) 100 Yards

Question 47

Leadmark bears 10 degrees high at 2.5 NM

Answer 47

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / = 10° x 2.5 / 3 = 25 / 3 = 8.1 Port of Track (SM would be Starboard of track) 810 Yards

Question 48

Leadmark bears 5 degrees high at 2 NM

Answer 48

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / = 5° x 2 / 3 = 10 / 3 = 3.3 Port of Track (SM would be Starboard of track) 330 Yards

Question 49

Leadmark bears 10 degrees low at 3 NM

Answer 49

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3 = 8° x 3 / 3 = 24 / 3 = 8 Starboard of Track (SM would be Port of track) 800 Yards

Question 50

Leadmark bears 4 degrees low at 4 NM

Answer 50

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3 = 4° x 4 / 3 = 16 / 3 = 5.3 Starboard of Track (SM would be Port of track) 530 Yards

Question 51

Leadmark bears 7 degrees high at 2 NM

Answer 51

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3 = 7° x 2 / 3 = 14 / 3 = 4.6 Port of Track (SM would be Starboard of track) 460 Yards

Question 52

Leadmark bears 6 degrees low at 3 NM

Answer 52

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3 = 6° x 3 / 3 = 18 / 3 = 6 Port of Track (SM would be Starboard of track) 600 Yards

Question 53

Leadmark bears 2 degrees low at 3 NM

Answer 53

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3 = 2° x 3 / 3 = 6 / 3 = 2 Starboard of Track (SM would be Port of track) 200 Yards

Question 54

Leadmark bears 5 degrees high at 3 NM

Answer 54

Lateral separation(Hundreds of Yards) = Angle off x Range(NM) / 3 = 5° x 3 / 3 = 15 / 3 = 5 Port of Track (SM would be Starboard of track) 500 Yards