The ratio of speed of a boat in still water to the speed of boat in upstream 4…
2024
The ratio of speed of a boat in still water to the speed of boat in upstream 4 : 3. The boat covers 560 km in 7 hours in downstream. Find the time taken by boat to cover 480 km distance in upstream?
- A.
8 hours
- B.
9 hours
- C.
7 hours
- D.
5 hours
- E.
10 hours
Attempted by 11 students.
Show answer & explanation
Correct answer: E
Let upstream speed be 3k and boat speed in still water be 4k; then downstream speed is 5k. Downstream speed = 560/7 = 80, so k = 16 and upstream speed = 48 km/h. Time for 480 km upstream = 480/48 = 10 hours.