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
Answers
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.
mak as brainliest
Answer:
Let the distance be = x km
Speed from A to B = 20 km/hr
Time taken = Distance/Time = x/20 hr
Speed from B to A = 30 km/hr
Time taken = Distnace/Time = x/30 hr
Total time = x/20 + x/30
=》 Total time = 5x/60
=》 Total time = x/12
Average speed = Total Distance/Total Time
=》 Average speed = x + x/(x/12)
=》 Average speed = 24x/x