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They together eat up the the distance of 108 miles at the following rate:
1st hr -10miles = 4+6
2nd hr - 11= 5+6
3 - 12
4 - 13 etc

So in such arifmetic progression 10,11,12,13,14,15... find at which term its sum is 108.
In this case if terms are odd, sum is mid term multiplied by number of terms.
Eg. In 5 hours, distance covered is 12×5=60.
You can find easily that in 7 hours the distace is 13×7=91, which is 17 km away. And 17 is 6+11 exactly meaning another hour needed.
So once you find it takes 8 hours, you find 48 km from p.
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