Trains Boats and Streams Practice Test 5 with solutions

Question : 7 of 8

Marks: +1, -0

A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?

1 hr. 30 min.
1 hr. 15 min.
1 hour
40 minutes

Validate

Solution:

Upstream speed =

2/1

= 2 km/hr
Downstream speed =

1/{{10}/{60}}

= 6 km/hr
Speed of boatman in still water =

1/2

(6 + 2) = 4 km/hr
Hence, time taken =

5/4

hr = 1 hr. 15 min.

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