Question

A train travels from station A to station B with a speed of 36 km/hr and returns to A with a speed of 54 km/hr. What is the average velocity and average speed of the t rain.

Experts i have a test so please help fast

Thank You

Answer 1

1) Let distance between A to B beX and time taken to go from A to B be T1 and B to A be T2.

Speed from A to B = 40 km/h

Time taken to go from A to B = X/40 [As time = distance /speed.]

Time taken to go fromB to A= X/30 [As time = distance /speed.]

Total Distance from A to B and B to A = 2X

Total Timefrom A to B and B to A = 7X/12

Avg. Speed = Total Distance / Total Time= 2X*12 / 7X = 24/7 km/hr.

2) Displacement = 0 [Start from A and back to A]

Avg. Velocity = Total displacement / Total Time = 0