1.

a car travels from place A to the place B at 20 km/hour and returns at 30 km/hour.The average speed of the car for the whole journey is​

Answer»

ANSWER:

EXPLANATION:

the distance between A and B is x km.

Speed of the car from A to B(U)  = 20 km/hr.

Therefore,

 time(T1) = x/20

Also,

Distance between B and A = x km.

Speed of the car from B to A(v) = 30 km/hr.

time(T2)= x/30

Thus,

total time = T1 + T2

              = x/20+ x/30

              = x/12 hr.

total distance covered by the car = x + x

                                                   = 2X

Using Formula,

AVERAGE Speed =  Total distance/Total time

                         =  2x/(x/12)

                         = 24 km/hr.

Thus, average speed of the car is 24 km/hr.Hope it will help u.

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