A car travels from home to college with a speed of 20 km/h. Then it returns back and travels with a speed of 30 km/h. Find average speed of the car.
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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.
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