Distance between A and B is 72 miles. Two men started walking from A and B at the same time towards each other. The person who started from A traveled uniformly with average speed 4 mph. While the other man traveled with varying speeds as follows: In first hour his speed was 2 mph, in the second hour it was 2.5 mph, in the third hour it was 3 mph, and so on. When will they meet each other?

(A) 35 miles away from A

(B) 32 miles away from B

(C) after 32 hours from start

(D) after 10 hours from start

(E) midway between A and B

i managed to solve it in my way which took 4 min , perhaps anyone can help me to solve it in 2 min

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