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40 x 26 = 1040 (distance Alan is ahead of Ben)
5/9 – 3/9 = 2/9 ——-> 1040
1/9 ——-> 1040/2 = 520
(5 x 520)/26 = 100 (Alan’s speed)
100 – 40 = 60 (Ben’s speed)
(520 x 4)/100 = 20.8 (time taken by Alan to complete 4/9 of the distance and Ben had to complete 6/9 of the distance in 20.8 min
(520 x 6)/20.8 — 150 (speed at which Ben would have to travel)
150 – 60 = 90

Ans : 90 m/min.

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