Boats And Streams

Question 1

Two times the difference between the speed of the boat downstream and upstream is 12kmph which is equal to the speed of the boat in still water, find the time taken by the boat to cover 54km in both upstream and downstream?
1) 10hrs:30min 2) 9hrs:36min 3) 10hrs:45min 4) 9hrs:45min 5) 10hrs:36min

Answer 1

(2)

4s=12
s=3
M=12