Question
City S and City T is 780 km apart. At 06 15, Xuan, travelling at a constant speed, left City S for City T. At the same time, Oliver set off from City T for City S at a constant speed which was 12 km/h faster than Xuan. Find Oliver's speed if they met at 12 15.
3 m

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City S and City T is 780 km apart. At 06 15, Xuan, travelling at a constant speed, left City S for City T. At the same time, Oliver set off from City T for City S at a constant speed which was 12 km/h faster than Xuan. Find Oliver's speed if they met at 12 15.