Question
PSLE
Carl and Opal started jogging at the same time from point L to point N along the route shown. Carl jogged 30 m/min faster than Opal. When Carl reached point N, he turned around at once to jog towards point L. He met Opal at point M. They did not change their speeds throughout. What was Opal's jogging speed in m/min?
2 m

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PSLE
Carl and Opal started jogging at the same time from point L to point N along the route shown. Carl jogged 30 m/min faster than Opal. When Carl reached point N, he turned around at once to jog towards point L. He met Opal at point M. They did not change their speeds throughout. What was Opal's jogging speed in m/min?