Rates, SM-Bank 094

Roy and Siegfried are driving from Broken Hill to Albury which is a distance of 840 kilometres.

After every two hours of driving, they rest for 20 minutes and swap drivers.

How long will their trip take if they average 80 km/h when driving? (2 marks)

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\(12\ \text{h }10\ \text{min}\)

Show Worked Solution

\(\text{Driving time}=\dfrac{840}{80}=10.5\ \text{h}\)

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

\(\therefore\ \text{Total trip time}\)	\(=10\ \text{h }30\ \text{m}+(5\times 20)\ \text{m}\)
	\(=10\ \text{h }30\ \text{m}+1\ \text{h }40\ \text{m}\)
	\(=12\ \text{h }10\ \text{min}\)