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A car complete a certain journey in 8 hour. It cover half the distance at 40 km/hr and the rest at 60 km/hr, The length of a journey is?

350 km.
420 km.
384 km.
400 km.

Correct Answer: 384 km.

Explanation:

Let the length of total journey be y km.
From question
( y/2 x 1/40 ) + ( y/2 x 1/60) = 8
⇒ y/80 + y/120 = 8
⇒ 3y + 2y = 1920
∴ y = 384 km.

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