Problem Solving (PS) | The average speed of Salem Express train

Aary

The average speed of Salem Express train is 60 kmph. if the halts at various stations is excluded then the average speed is 80 kmph. What is the average halt time (in hours) per hour of Salem Express?

A. 0.20
B. 0.25
C. 0.30
D. 0.35
E.0.40

[color=#0000ff] Given, average speed (with halts) = 60 km/h.............(1)
average speed (without halts) = 80 km/h.........(2)

So, Salem Express train should travel in 1 hour = 80 km
But, actually (ie, with
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