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Starting from home, Mr and Mrs Little began walking along a straight road in opposite directions.

They were 20 km apart after 2 h 30 minutes.

Mr Little was walking at an average speed of 1.5 km/h faster than Mrs Little.

(a) What is Mr Little's average walking speed?

(b) What is Mrs Little's average walking speed?

Notes to student:

If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12