Question
City Y and City Z is 820 km apart. At 07 40, Jen, travelling at a constant speed, left City Y for City Z. At the same time, Simon set off from City Z for City Y at a constant speed which was 12 km/h faster than Jen. Find Simon's speed if they met at 12 40.
3 m

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City Y and City Z is 820 km apart. At 07 40, Jen, travelling at a constant speed, left City Y for City Z. At the same time, Simon set off from City Z for City Y at a constant speed which was 12 km/h faster than Jen. Find Simon's speed if they met at 12 40.