Question

A train travels 70 kilometers in 4 hours, and then 55 kilometers in 3 hours. What is its average speed?

Answer 1

The average speed:

`v=(total\ distance)/(total time)`

We have

total distance = 70 km + 55 km = 125 km

total time = 4 h + 3 h = 7 h

The average speed:

`v=(125\ km)/(7\ km)\approx18\ (km)/(h)`

Answer 2

Distance = 70 + 55 = 125 kilometers

Time = 4 + 3 = 7 hours

Rate = Distance / Time

Rate = 125 / 7 = 17.8571428571 kilometers per hour

Explanation: