Question
PSLE
Dana and Luis ran in a race. When Luis had completed the race, Dana had only run 47 of the distance. Dana's speed was 81 m/min slower than Luis's speed. Both of them did not change their speeds throughout the race. What was Luis's speed in m/min?
3 m

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PSLE
Dana and Luis ran in a race. When Luis had completed the race, Dana had only run 47 of the distance. Dana's speed was 81 m/min slower than Luis's speed. Both of them did not change their speeds throughout the race. What was Luis's speed in m/min?