a car travels 30 km at uniform speed of 40 km per hour and the next 30 km at the uniform speed of 20 km per hour find the average speed
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avg speed = total distance/total time
time = distance/speed
t1= 30/40hour
t2=30/20 hour
avg speed = 30/(30/40) +30/(30/20)
30/(3/4) + 30/(3/2)
30+30/(6+12/8)
60/(18/8)
60×8/18
26.66km/hour
time = distance/speed
t1= 30/40hour
t2=30/20 hour
avg speed = 30/(30/40) +30/(30/20)
30/(3/4) + 30/(3/2)
30+30/(6+12/8)
60/(18/8)
60×8/18
26.66km/hour
ashu3041:
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