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Multiplication of Decimals

A scooterist ...

Question

A scooterist completes a certainjoumey in 10 h. He covers half the distance at 30 km/h and the rest at 70 km/h. What is the total distance of the journey?

A

210 km

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B

400 km

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C

420 km

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D

500 km

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Solution

The correct option is C 420 km
Average speed $= \frac{2 \times 30 \times 70}{30 + 70} k m p h = 42 k m p h$
$∴$ Required distance travelled $10 \times 42 = 420 k m$

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