A train travels at a speed of 30 km/hr for 12 minutes and at a speed of 4 km/hr for the next 8 minutes. The average speed of the train for this journey is `30\ k m//h r` b. `36 k m//h r` c. `37.\ k m//h r` d. `48\ k m//h r`

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

A car travels the first one-third of a certain distance with a speed of 10 k m//h r the next one-third distance with a speed of 20 k m//h r and the lat one-third distance with a speed of 60 k m//h r . The average speed of the car for the whole journey is 18 k m//h r b. 24 k m//h r c. 30 k m//h r d. 36 k m//h r

A car travels the first one third of a certain distant with a speed of 10 km/hr, the next one third distant with a speed of 20 km/hr and the last one third distance with a speed of 60 km/hr. The average speed of the car for the whole journey is 18 k m//h r b. 24 k m//h r c. 30 k m//h r d. 36 k m//h r

A train travels at a speed of 60 km/h for 0.52 h, at 30 km/h for the next 0.24 h and then at 70 km/h for the next 0.71 h. What is the average speed of the train ?

A train travels at a speed of 40 km/hr and another train at a speed of 20 m/s. What is the ratio of speed of the first train to that of the second train?

A train covers the first 5km of its journey at a speed of 30km/hr and the next 15km at a speed of 45km/hr .What is the average speed of the train?

A train travels at 60 km//h for 0.50 h , at 30 km//h for the next 0.24 h and at 70 km//h for the next 0.71 h . What is the average speed of the train ?