A car travels a certain distance with a speed of 30km/h and returns with a speed of 45km/h.calculate the average speed of a car
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please give me the time period taken???????????????????????
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let the car travels a distance x km at 30 km/h.
=> x/30 hours.
as car travels the same distance x km at 45 km/h.
=> x/45 hours.
Total distance= 2x km
Total time= x/30 + x/45 hs
Avg speed = Total dist. / Total time
=> 2x / (x/30 + x/45)
=> 2 * 30 * 45 / (30 + 45)
=> 36 km/hr.
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