Displaying Data, SM-Bank 028

Melinda and Cathy run the 100 metre sprint in their school athletics carnival.

A device tracks their progress and the results are shown in separate line graphs below.

Melinda starts quickly and passes the 75 metre mark after 10 seconds, slowing down as the race progresses.

Cathy is slower but runs the whole race at the same speed.

Approximately how long after Melinda did Cathy pass the 75 metre mark in the race? (2 marks)

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\(5\ \text{seconds}\)

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\(\text{Melinda passes 75 metre mark at 10 seconds.}\)

\(\text{Cathy passes at approximately 15 seconds.}\)

\(\therefore\ \text{Cathy passes approximately 5 seconds after Melinda.}\)