Question
A motorist covers a distance of 39 km in 45 minutes by moving at a speed of` x` kmph for the first 15 minutes , then moving at double the speed for the next 20 minutes and then again moving at his original speed for the rest of the journey. Then `x` is equal to :
Answer: Option B
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`x xx 15/60 + 2x xx 20/60 + x xx 10/60 = 39`
`rArr (x)/(4) + (4x)/(3) + (x)/(6) `= 39
`rArr 3x + 8x + 2x = 468 rArr x `= 36.
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