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Q.

A person crosses a 600m long street in 5 minutes, what is his speed in km per hour ?


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a

3.6

b

7.2

c

8.4

d

10 

answer is B.

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Detailed Solution

Concept- Converting distance by using the formula ,  speed=distancetime, 1 km =1000m
Given, distance = 600m, time = 5minutes
 x km=600 m
 x=6001000km
x=0.6 km
Converting time, 5 minute in hour
y=560h
 y=0.083 h
speed=distancetime
=0.60.083
= 6×100083×10
=6000830
=60083
=7.2kmh
Hence, the correct option is 2.
 
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A person crosses a 600m long street in 5 minutes, what is his speed in km per hour ?