A car moves from chennai to bangalore at a speed of 40 kmph and returns back at a speed of 60 kmph. Find the average speed of the car?
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Question
A car travels at a speed of 60 km/h and returns with a speed of 40 km/h. Calculate the average speed for the whole journey.
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time & distance
4 years ago, Ananya Mishra
5 Answers
since equal distances are covered at 60 kmph and 40 kmph, we can apply the formula 2xy/(x+y)
Average speed=
2
×
40
×
60
40
+
60
= 48 kmph
This formula works as follows
Let the distance to one side = x
Total distance = 2x
Time taken for the forward journey =
x
60
Time taken for the return journey =
x
40
Total time =
x
60
+
x
40
=
100
x
2400
Average speed =
Total distance
Total Time
=
2
x
(
100
x
2400
)
= 48 kmph