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Question

A car covers 20 km in 40 mins while a bike covers 20 km in 30 mins. What is the difference in their rates?

A
13 km/min
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B
15 km/min
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C
16 km/min
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D
25 km/min
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Solution

The correct option is C 16 km/min
Given,
A car covers 20 km in 40 mins.
in one minute, it will cover
=2040 = 12 km/min

Again, a bike covers 20 km in 30 mins.
in one minute, it will cover
=2030 = 23 km/min

So, the difference in their rate or speed
= 2312 = 16 km/min

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