Question
PSLE
Gwen and Zeph ran in a race. When Zeph had completed the race, Gwen had only run 57 of the distance. Gwen's speed was 78 m/min slower than Zeph's speed. Both of them did not change their speeds throughout the race. What was Zeph's speed in m/min?
3 m

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PSLE
Gwen and Zeph ran in a race. When Zeph had completed the race, Gwen had only run 57 of the distance. Gwen's speed was 78 m/min slower than Zeph's speed. Both of them did not change their speeds throughout the race. What was Zeph's speed in m/min?