A moter cycle travels 30 km in30 minutes than 45km in 40 minutes and 15 km in 20 minutes. What is its average speed?
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Answer:
60 km/h
Explanation:
d1 = 30 km t1 = 30 min = 1/2 hrs
d2 = 45 km t2 = 40 min = 2/3 hrs
d3 = 15 km t3 = 20 min = 1/3 hrs
So,
Average speed = (total dist.)/(total time) = (d1 + d2 + d3)/(t1 + t2 + t3)
= (30 + 45 + 15)/(1/2 + 2/3 + 1/3)
= (90) ÷ ((3 + 4 + 2)/6)
= 90 ÷ 9/6
= 90 * 6/9
= 10 * 6
= 60 km/h
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