Rates, SM-Bank 093

Oscar and Lucinda are driving from Dungog to Bourke which is a distance of 735 kilometres.

After every two hours of driving, they rest for 15 minutes and swap drivers.

How long will their trip take if they average 70 km/h when driving? (2 marks)

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\(11\ \text{h }45\ \text{min}\)

Show Worked Solution

\(\text{Driving time}=\dfrac{735}{70}=10.5\ \text{h}\)

\(\text{Number of stops}=5\)

\(\therefore\ \text{Total trip time}\)	\(=10\ \text{h }30\ \text{m}+(5\times 15)\ \text{m}\)
	\(=10\ \text{h }30\ \text{m}+1\ \text{h }15\ \text{m}\)
	\(=11\ \text{h }45\ \text{min}\)