Question
A can complete a journey in 10 hours. He travels first half of the journey at the rate of 21 km/hr and second half at the rate of 24 km/hr . Find the total journey in km.
Answer: Option B
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Let the total distance be `x` km. Then
`(1/2 x)/(21) + (1/2 x)/(24)` = 10
`rArr x/21 + x/24 `= 20
`rArr 15x = 168 xx 20 rArr x = ((168 xx 20)/(15))` = 224 km.
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