A train travels in a straight line at a constant speed of 60 km/h for

1.	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
Answer» Explanation: 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

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

Answer»

Explanation:

Let distance from A to B=x km= distance from B to A.

TIME TAKEN by TRAIN from A to B =

Time taken by train from B to A =

Total time taken by train =

240

average speed=

total time

total distance

240

480

km h

−1

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