Q1.A train travels in a straight line at a constant speed of 60 km/h for a particular distance d and then travels another distance equal to 2d in the same direction at a constant speed of 80 km/hr in the same direction as it was in the it was previously going a) What is the average speed of the train during the whole journey.
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Answered by
1
Answer:
prince reply
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Answered by
2
Answer:
Let distance from A to B=x km= distance from B to A.
Time taken by train from A to B =
60
x
hr
Time taken by train from B to A =
80
x
hr
Total time taken by train =
60
x
+
80
x
=
240
7x
hr
average speed=
total time
total distance
=
240
7x
2x
=
7
480
km h
−1
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