Answers

2016-05-01T15:29:50+05:30

This Is a Certified Answer

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Speed=20 km/hr = 5/18 × 20 = 50/9 m/s
Time = distance/speed
⇒400/(50/9)
⇒400×9/50
⇒8×9
72 sec....
72 sec=72/60=6/5=1.2 min
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2016-05-01T15:36:23+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
400 mts with 20kmph
4000 mts=0.400km
NOW
time=distance/speed
time=0.400/20
Time=0.02 hours
IN minutes=0.02*60
1minute 20 seconds
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