Question

a train covers the first 160 km of a journey at 40 km per hour the next 180 km at 45 km per hour and the last 200 km at 50 km per hour find the total time it takes to complete the journey and the average speed of the train during the whole journey

Answer 1

Time taken is 12 hours

Answer 2

Total Time= 160/40 + 180/45 + 200/50
= 4+4+4 = 12 hrs

speed average= total distance/ total time taken
= (160+180+200)/12
= 540/12 = 45 km/h