Question

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

Answer 1

Answer:

Hi.

Here is your answer-----------

Let 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.

Have a nice day.