Question

A train travels at a speed of 70 kilometre per hour for 0.50 hours and 40 kilometre per hour for 0.30 hours and then at 80 kilometre per hour for next 0.77 hours what is the average speed of the train​

Answer 1

1st speed=70 km/hr

2nd speed= 40km/hr

3rd speed= 80km/hr

Therefore average speed= (70+40+80)km/hr

                                           =190km/hr (Ans)