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2015-11-04T13:19:28+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.
given,
total distance = 142 km
average speed = 14 km/hr
therefore time taken,
average speed = total distance / total time 
14 = 142 / t.time
14 t = 142
t.time = 142 / 14
t.time = 10.1 hr
therefore time taken = 10 hours...
     i hope that this will help u............................^_^
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2015-11-04T13:39:10+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.
Marathon runners run at a average speed of 14 km/hr
to cover 14km, they need = 1 hour
to cover 142 km, they need = 142/14 = 71/7 hour = 10.14 hour

∴ it will take 10.14 hours to complete a distance of 142 km
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