Question

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.​

Answer 1

Answer:

To Find :-

Average speed

Solution :-

◼ I n C a s e 1 :-

↠ Time = Distance/Speed

↠ Time = d/60

◼ I n C a s e 2 :-

↠ Time = Distance/Speed

↠ Time = 2d/80

Average speed = Total distance/Total time

↠ Total distance covered = d + 2d

↠ Total distance covered = 3d

↠ Total time taken = d/60 + 2d/80

↠ Total time taken = 4d + 6d/240

↠ Total time taken = 10d/240

↠ Total time taken = d/24

Using above formula

↠ Average speed = 3d/(d/24)

↠ Average speed = 3d/1 × 24/d

↠ Average speed = 72d/d

↠ Average speed = 72 km/h

Answer 2

Answer:

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