A boy ran for 15 minutes at an average speed of 20 km/h. He then continued to run at an average speed of 12 km/h for 30 minutes. What was the total distance he ran?
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Answer:
Initial speed of boy = 10 km/hr = 10 *1000/3600 m/sec.
Let the required speed be ‘s’.
In 15 minutes with initial speed, he will cover = 10 * 1/4 = 2.5 km
If average speed after 30 minutes is 12 km/hr, then the total distance covered by him will be ,
= 12 * 1/2 = 6 km
The distance covered in the next 15 minutes will then be,
s * 1/4 = 6 -2.5 = 3.5 km
Hence the required speed = 3.5 * 4 =14 km/hr
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