Algebra, STD2 EQ-Bank 30

James lives 20 kilometres from his workplace.

On Monday, he drove to work and averaged 80 kilometres per hour.

On Tuesday, he took the train which averaged 40 kilometres per hour.

What was the extra time of the train journey, in minutes, compared to when he drove on Monday? (2 marks)

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\(\text{15 minutes}\)

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\(\text{Time driving on Monday:}\)

\(t=\dfrac{\text{distance}}{\text{speed}}=\dfrac{20}{80}=0.25\ \text{hours}=15\ \text{minutes}\)

\(\text{Time taken on train on Tuesday:}\)

\(t=\dfrac{20}{40}=0.5\ \text{hours}=30\ \text{minutes}\)

\(\text{Extra time}=30-15=15\ \text{minutes}\)