Question

a train travels some distance with a speed of 30km/h and returns with a speed of 45km/h. Calculate the average speed of the train.​

Answer 1

let distance be D km

total time taken, T (hrs) = D/30 + D/50

Average speed , V = total distance/ total time = 2D/T = 2/(1/30+1/50) = 37.5 km/hr

Step-by-step explanation:

Answer 2

Average speed = total distance / total time

= (30+45) km / 2hr

= 75 / 2

= 37.5 km/hr is the average speed of the train.