A body travels with a constant speed 20 km/hr for a time 1hour and then with a constant speed 35 km/hr for a time 2 hour. What is its average speed?
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class 11th
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Explanation:
d1 = speed × time
= 20 × 1
= 20 km
d2 = speed × time
= 35 × 2
= 70 km
average speed = total distance/total time
= 20 + 70/ 1 + 2
= 90/3
= 30 km/h
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