Trains Boats and Streams Practice Test 4 with solutions

Question : 33 of 40

Marks: +1, -0

The speed of a boat in the still water is 5 km/hour. If it travels 13 km downstream and 7 km upstream in the same time, then the speed of the current is:

1 km/hour
0.85 km/hour
1.5 km/hour
None of these
Cannot be determined.

Validate

Solution:

Let the speed of current = x km/hour
According to the question,

{13}/{5+x}

7/{5-x}

65 - 13x = 35 + 7x
20x = 30
x =

3/2

= 1.5 km/hour

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