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City A and city B were separated by a distance of 840 km.
From city A, a bus travelled towards city B at an average speed of 50 km/h at 10 a.m. .
At the same time, a car drove from city B towards city A at an average speed of 70 km/h.
(a) How far would the bus have travelled when it passes the car along the way?
(b) How far would the car have travelled when it passes the bus along the way ?
Notes to student: