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Q.

A scooterist completes a certain journey in 10 hours. He covers half the distance at 30 km/hr and the rest at 70 km/hr. The total distance of the journey is

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a

400 km

b

450 km

c

420 km

d

500 km

answer is B.

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Detailed Solution

Let the total distance of the journey be x km

Then x2+x2

x230+x270=10

x30+x70=20⇒7x+3x210=20

x=20×21010=420km

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