A student used to go to his coaching institute every evening and he takes 20 min. Once on his way, he realised that he had forgotten his book at home. He knew if he continued walking to the coaching at the same speed ,he would be there 8 min before the bell, so he went back home for the book and arrive the coaching 10 min late , If he had walked all the way with his usual speed,the fraction of the way to coaching institute had he covered at that moment when he turned back is x/20.
Find the value of x.

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Solution

COMPARING THE VALUE OF FRACTION AND FROM GIVEN FRACTION OF X/20 WE GET X=9

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