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A boy runs 5 minutes at a uniform speed of 10 km/h .At what speed should he run for the next 10 minutes so the average speed comes to 12 km/h
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A boy runs 5 minutes at a uniform speed of 10 km/h .At what speed should he run for the next 10 minutes so the average speed comes to 12 km/h
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Answer:
heya here is your answer mate....❤❤❤
Explanation:
Let us solve this in a different way.
Boy runs for first 5 min at 10 kmph = 10 km/hr
Let boy run for next 10 min at V kmph
let boy run for next 10 min at V kmph
His average speed is average of above three.
Average speed = (10+ 2 V) / 3 = 12 kmph
So 10 + 2 V = 3 * 12 = 36
2 V = 36 - 10 =26
V = 26/2 = 13 km/hr