The ratio of speed of a boat in downstream to upstream is 5 : 3 and total time…
2021
The ratio of speed of a boat in downstream to upstream is 5 : 3 and total time taken by boat to cover 30 km distance in upstream is 5 hours. Find time taken by boat to cover 40 km in downstream.
- A.
4 hours
- B.
6 hours
- C.
8 hours
- D.
2 hours
- E.
3 hours
Attempted by 23 students.
Show answer & explanation
Correct answer: A
Upstream speed = 30/5 = 6 km/h. Downstream:upstream = 5:3, so downstream speed = 10 km/h. Time for 40 km downstream = 4 hours.