Trains Boats and Streams Practice Test 3 with solutions

Question : 5 of 40

Marks: +1, -0

A motorboat in still water travels at a speed of 36 km/hr. It goes 56 km upstream in 1 hour 45 minutes. The time taken by it to cover the same distance down the stream will be:

1 hr. 24 minutes
2 hr. 21 minutes
2 hrs. 25 minutes
3 hours

Validate

Solution:

Upstream speed =

{56}/{1 3/4}

56 × 4/7

= 32 km/hr
Hence, speed of the current = 36 – 32 = 4 km/hr
Downstream speed = 36 + 4 = 40 km/hr
Hence, time taken =

{56}/{40}

7/5

hr = 1 hr. 24 min

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