Question

A train travels from a to b at the speed of 20 km. /hr. and from b to a at the speed of 30 km. /hr. then what is the average speed of train in km. /hr.? 1) 24 kmph 2) 42 kmph 3) 34 kmph 4) 48 kmph

Answer 1

avg = 2s1 × s2/s1+s2=2×20×30/50=24km/hr