Question

Ek train 60 km per hour ki speed se jati h or 30 km per hour ki speed se vapis aati h to iski average speed kya hogi

Answer 1

avg.speed is distance upon time

let distance be x

avg. speed is 2x/t1+t2

2x/distance/speed+distance/speed

2x/x/60+x/30

2x/x+2x/60

2x/3x/60

2x*60/3x

40kmph