Question
PSLE
Mark and Shannon started jogging at the same time from point W to point Y along the route shown. Mark jogged 20 m/min faster than Shannon. When Mark reached point Y, he turned around at once to jog towards point W. He met Shannon at point X. They did not change their speeds throughout. What was Shannon's jogging speed in m/min?
2 m

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PSLE
Mark and Shannon started jogging at the same time from point W to point Y along the route shown. Mark jogged 20 m/min faster than Shannon. When Mark reached point Y, he turned around at once to jog towards point W. He met Shannon at point X. They did not change their speeds throughout. What was Shannon's jogging speed in m/min?