Question
PSLE
Zane and Risa started jogging at the same time from point M to point P along the route shown. Zane jogged 40 m/min faster than Risa. When Zane reached point P, he turned around at once to jog towards point M. He met Risa at point N. They did not change their speeds throughout. What was Risa's jogging speed in m/min?
2 m

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PSLE
Zane and Risa started jogging at the same time from point M to point P along the route shown. Zane jogged 40 m/min faster than Risa. When Zane reached point P, he turned around at once to jog towards point M. He met Risa at point N. They did not change their speeds throughout. What was Risa's jogging speed in m/min?