Question

A train returns from Howrah to Haldia at 60 miles an hour and from Haldia to Howrah at 40 miles an hour.Calculate the average speed of the train.​

Answer 1

Step-by-step explanation:

Speed = Distance / Time

let distance be 120

Time = Distance / Speed

120/60 = 2 hrs

120/40 = 3 hrs

Average = 120+120 / (2+3)

240/5

48 miles / km

Answer 2

Step-by-step explanation:

Distance be the lcm of 60,40

= 120km

Howrah to Haldia Time = 120/60

= 2 hrs

Haldia to Howrah Time=120/40=

= 3 hrs

Av.speed=(120 +120)/3+2

= 240/5=48 km/hr. Ans