Men are running along a road at 15 km/hr behind one another at equal intervals of 20 m. Cyclists are riding in the same direction at 25 km/hr at equal intervals of 30 m. at what speed an observer must travel along the road in opposite direction so that whenever he meets a runner , he also meets a cyclist?

Dear Pooja,

Use the relation Vab = Va-Vb to get the required answer.

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@sir, i did the same thing but i am  not able to proceed furthur. Can u please solve the question and let me know the answer? please