physics

On a 60 km straight road,a bus travels the first 30km with a uniform speed of 30kmh .How fast must the bus travel the next 30 km so as to have average speed of 40 kmh for entire trip.

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  1. First 30km with a speed of 30km/h means it took 1 hour.

    For an average of 40km/h over 60 km, total time = 60/40 = 1.5 hours.

    Time left for 30 km = 1.5-1 = 0.5 h.

    Can you calculate the speed needed for the second half of the journey?

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  4. Total Time taken t= distance / average speed=60/40=1.5h

    Time taken to cover first half T1=30/30=1h
    Time taken to cover second half T2=30/V
    Now,T=T1+T2=1.5=1+30/V
    Then,1.5V=1V+30
    30=1.5V-1V
    30=0.5V
    30/0.5=V
    Hence,V=60kmh

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