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A motorist covers a distance of 39 km...

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 seed for the next 20 minutes and then again moving at his original speed for the rest of the journey. The `x` is equal to `31. 2` b. `36` c. `52` d. `40`

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RS AGGARWAL-TIME AND DISTANCE-All Questions
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