4. Raghu covers 20 km in 2 hours. Find his speed.
(i) Per hour
(ii) Per minute
(iii) second
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Answer:
Given,
Distance travelled = 20 km = 20,000 m
Time taken = 2 hours = 120 minutes = 7200 seconds
(i) His speed per hour
=> 20km/2 hour = 10km/h
(ii) His speed per minute
=> 20,000m/120mim = 166.6 m/min
(iii) his speed per second
=> 20,000m/ 7200 sec = 2.7m/sec
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