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Mathematics Olympic starting line fifth grade ability test paper 2 question 5
When they met, A traveled 3 1.5×2=63 kilometers more than B.

It takes 63÷ 12=5.25 hours to drive the 63 kilometers.

It takes 5.25-4.5 = 0.75h to drive 3 1.5km at a time.

A speed is 31.5 ÷ 0.75 = 42km/h.