Question

A train travel a certain speed of 90km/h and return back with a speed of 60km/h find out the average speed ​

Answer 1

case 1

let time be t

s ?

v 90kmph

t = t

s = v × t

90t

Case 2

s ?

v 60kmph

t = t

s = v×t

60 t

now total distance = 90t + 60t

150t

total time = t + t

2t

average speed = total distance ÷ total time

= 150t÷2t

answer =75km/hr

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