A boy rides his bicycle 10 km at an average speed of 12 km/hr and again travels 12 km at an average speed of 10 km/hr. His average speed for the entire trip is approximately:
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Answer:
Explanation:
Total Distance = 10 +12 = 22 km
Total time = 10/12 + 12/10 = 5/6 + 6/5 = 25/30 + 36/30 = 61/30 hours
Average speed = 22 / 61/30 = 660/61 = 10.8 km/ hour
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Answer:
case 1
distance=10km
speed=12km/hr
time=10/12hr
case2
distance=12km
speed=10km/hr
time=12/10hr
total distance=10+12=22km
total time=10/12+12/10=(100+144)/120=244/120
average speed=total distance/total time
=22/244/120
=22*120/244
=2640/244
=10.819km/hr
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