Algebra, STD2 EQ-Bank 21

Maria drove 420 km in 6 hours. Her average speed for the first 280 km was 80 km per hour.

How long did she take to travel the last 140 km? (2 marks)

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\(\text{2.5 hours}\)

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\(\text{First 280 km:}\)

\(t=\dfrac{\text{distance}}{\text{speed}}=\dfrac{280}{80}= 3.5\ \text{hours}\)

\(\text{Total time}=6\ \text{hours}\)

\(\text{Time for first 280 km}=3.5\ \text{hours}\)

\(\text{Time taken for last 140 km}=6-3.5=\text{2.5 hour}\)