A car travels first 150 km at 30 km/h and the next 120 km at 40 km/h. Its average speed is:
A
30.25 km/h
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B
35.55 km/h
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C
33.75 km/h
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D
38.65 km/h
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Solution
The correct option is C 33.75 km/h Timetakenforfirstspeed=DistanceSpeed =150km30km/h=5hours Timetakenfornextspeed=DistanceSpeed =120km40km/h=3hours Totaltimetaken=3hours+5hours =8hours Totaldistance=150km+120km =270km Averagespeed=TotaldistancetravelledTotaltimetaken =270km8hours=33.75km/h