Let the speed of the boat in still water be 17 km/h and let the speed of the stream be 5 km/h. What is the time taken by the boat to go 110 km downstream?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 5 hours.
Speed = Distance/Time
If the speed of the boat in still water is 'v' and the speed of the current is 'u':
Then, downstream speed = v + u
Then, downstream speed = 17 + 5 = 22 km/h
Hence,
Time will be taken to go 110 km,
⇒ 110/22 = 5 hr