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:

$v=\dfrac{total\ distance}{total time}$

We have

total distance = 70 km + 55 km = 125 km

total time = 4 h + 3 h = 7 h

The average speed:

$v=\dfrac{125\ km}{7\ km}\approx18\ \dfrac{km}{h}$

Answer 2

Answer:

Distance = 70 + 55 = 125 kilometers

Time = 4 + 3 = 7 hours

Rate = Distance / Time

Rate = 125 / 7 = 17.8571428571 kilometers per hour

Step-by-step explanation: