Time, Speed & Distance
Aptitude

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Q.

A boat covers a distance of 30 km downstream in 2 hour while it takes 6 hour to cover the same distance upstream. What is the speed of the boat in km/hr

 A.

5

 B.

7.5

 C.

10

 D.

12

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Solution:
Option(C) is correct

Let $b$ and $s$ be the speed of boat and stream respectively.

As per the given conditions:

\(\dfrac{30}{b+s}=2\)-----(1)

\(\dfrac{30}{b-s}=6\)

From eq (i) and (ii):

$s = 5$ and $b$ = 10 km/hr


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