Question

13. The graph below represents the journey of a steam train. The vertical axis represents the distance from the station in kilometers.
a. How far did the train travel in first 40 minutes?
b. Work out the speed of the train between A and B. Give your answers in kilometers per hour.

Answer 1

a. 10 km

b. 15 km/hour

Explanation:

a. How far did the train travel in first 40 minutes?

Reading the graph we see that at 40 minutes the steam train is in point C which correspond to 10 km.

b. Work out the speed of the train between A and B. Give your answers in kilometers per hour.

Knowing that in point B the train traveled 10 km in 40 minutes, we devise the following reasoning:

if the train travels         10 km in 40 minutes

then the train travels    X  km in 60 minutes (1 hour)

X = (60 × 10) / 40 = 15 km/hour

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