Trains Boats and Streams Practice Test 4 with solutions

Question : 39 of 40

Marks: +1, -0

A boat takes 6 hours to travel from place M to N downstream and back from N to M upstream. If the speed of the boat in still water is 4 km/hr; what is the distance between two places?

6 kms
8 kms
12 kms
Data inadequate

Validate

Solution:

Let d km be the distance and x km/hr be the speed of the stream, then

d/{4+x}+d/{4-x}

= 6
Here x is not known, so d cannot be determined, hence, data is inadequate.

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