A car moves first 20 km at a speed of 50 km/h and the next 20 km at a speed of 70 km/h . Calculate the average speed of the car .
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car takes 2/5hr. for 20kms in first condition
for next 20kms car takes 2/7hr.
total Dts.=20+20=40km
we know that, S=D/T
=40/2/5+2/7
=40/24/35
=40×35/24
=58.33km/hr.
for next 20kms car takes 2/7hr.
total Dts.=20+20=40km
we know that, S=D/T
=40/2/5+2/7
=40/24/35
=40×35/24
=58.33km/hr.
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