A car travels first 450kms of a journey at a speed of 90kmph and the remaining 750kms at a speed of 50kmph find the average speed of the whole journey
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A car covers first 450km at 90kmph and the remaining 750km at 50kmph. what is the average speed of the car for the whole journey?
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Sudhanshu Shekhar, B.SC Mathematics & Physics, University of Delhi (2014)
Answered Mar 9, 2018 · Author has 55answers and 30.2k answer views
formula ; distance = speed * time
case1 : Distance = 450 km ; speed = 90 kmph
time = distance/speed
t = 450/90
= 5 h
case2 : distance = 750 km ; speed = 50 kmph
time = 750/50
= 15 h
total distance = 450+750 = 1200 kmph
total time = 5+15 = 20 h
so average speed of total journey = total distance / total time
average speed = 1200/20 = 60 kmph
please mark as BRAINliest answer
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5 ANSWERS

Sudhanshu Shekhar, B.SC Mathematics & Physics, University of Delhi (2014)
Answered Mar 9, 2018 · Author has 55answers and 30.2k answer views
formula ; distance = speed * time
case1 : Distance = 450 km ; speed = 90 kmph
time = distance/speed
t = 450/90
= 5 h
case2 : distance = 750 km ; speed = 50 kmph
time = 750/50
= 15 h
total distance = 450+750 = 1200 kmph
total time = 5+15 = 20 h
so average speed of total journey = total distance / total time
average speed = 1200/20 = 60 kmph
please mark as BRAINliest answer
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