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Given that the speed of Terry is twice that of Jim, and that they started at the same time, this means that Terry would have travelled 2 units of distance while Jim would have travelled only 1 unit of distance when they met 2 hours later (12 pm – 2 pm)

Since the total distance between A and B is 45 km, this means that Terry travelled 30 km while Jim only travelled 15 km.

Jim’s speed 15 km ÷ 2 hrs
= 7.5 km/h

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Thank you all for the explanation

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Terry + Jim

d=45km

t=2h

s=45/2=22.5km/h

3u = 22.5km/h

Jim, 1u = 22.5/3=7.5km/h

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