A man will be starts runnining a car in 1st round about 20 km at 30km/hr. and; in next round ,the car will be run about 30 km at 20 km/hr. ; then find the average speed ....
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Answered by
0
Answer:
avg speed total distance/ total time
total distance=50km
total time=2/3+3/2=13/6
avg speed=300/13
Answered by
1
Answer:
23.08 km/h
Explanation:
Total Distance = 20 km +30 km = 50 km
Time in first half = 20/30 h = 2/3 h
Time in second half = 30/20 h = 3/2 h
Total Time = 2/3 + 3/2 = 4/6 + 9/6 = 13/6 h
Average Speed = 50 ÷ 13/6 km/h = 50 × 6 ÷ 13 km/h = 23.08 km/h
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