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Q.

A person crosses a 600 min long street in 5 minutes. What is his speed in kmph

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a

10

b

7.2

c

8.4

d

3.6

answer is B.

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Detailed Solution

Speed $= \frac{600}{5} = 120 \min$

$= \frac{120}{60} \times \frac{18}{5} kmph$

$= \frac{36}{5}$

$= 7.2 kmph$

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