Question
Tom jogged while Yoko walked from the same place but in opposite directions along a straight road. After 4 hours, they were 30 km apart. Tom’s average speed was 2.1 km/h faster than Yoko’s average speed. What was Yoko’s average walking speed in km/h? Express your answer in decimal.
3 m

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Tom jogged while Yoko walked from the same place but in opposite directions along a straight road. After 4 hours, they were 30 km apart. Tom’s average speed was 2.1 km/h faster than Yoko’s average speed. What was Yoko’s average walking speed in km/h? Express your answer in decimal.