A person crosses a 600 m long street in 5 minutes. what is his speed in km per hour ?
8.4
7.2
3.6
10
A
8.4
B
10
C
3.6
D
7.2
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Solution
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Distance=600m
Time=5 min=5\times 60 sec
Speed=Distancetimes
⇒6005×60m/sec
⇒2msec⇒2×185=7.2Km/hr
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