Question
PSLE
Opal and Riordan ran in a race. When Riordan had completed the race, Opal had only run 58 of the distance. Riordan's speed was 78 m/min faster than Opal's speed. Both of them did not change their speeds throughout the race. What was Opal's speed in m/min?
3 m

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PSLE
Opal and Riordan ran in a race. When Riordan had completed the race, Opal had only run 58 of the distance. Riordan's speed was 78 m/min faster than Opal's speed. Both of them did not change their speeds throughout the race. What was Opal's speed in m/min?