Question
City M and City N is 615 km apart. At 08 50, Risa, travelling at a constant speed, left City M for City N. At the same time, Oscar set off from City N for City M at a constant speed which was 11 km/h faster than Risa. Find Oscar's speed if they met at 13 50.
3 m

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City M and City N is 615 km apart. At 08 50, Risa, travelling at a constant speed, left City M for City N. At the same time, Oscar set off from City N for City M at a constant speed which was 11 km/h faster than Risa. Find Oscar's speed if they met at 13 50.