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Two trains start from the same station at the same time, train A is going north

bound while train B is going south bound. After 5 minutes the trains are 10km

apart, in 15 minutes they are 30km apart. How many minutes will it take for the

trains to be 50km apart?

a. 22 minutes

b. 25 minutes

c. 28 minutes

d. 31 minutes
solution Nd formula too​ desperate for answers na​