Question
Vaidev jogged while Betty walked from the same place but in opposite directions along a straight road. After 4 hours, they were 30 km apart. Vaidev’s average speed was 2.2 km/h faster than Betty’s average speed. What was Betty’s average walking speed in km/h? Express your answer in decimal.
3 m

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Vaidev jogged while Betty walked from the same place but in opposite directions along a straight road. After 4 hours, they were 30 km apart. Vaidev’s average speed was 2.2 km/h faster than Betty’s average speed. What was Betty’s average walking speed in km/h? Express your answer in decimal.