Question

In a 1200 m race, bike A beats bike B by 100
m. bike B beats bike C by 100 m in a 600 m race. If bike A beats bike C by 30 sec in a 720 m race, then what is the speed of bike C?

A 15/2 m/sec
B 19/3 m/sec
C 17/3 m/sec
D 11/3 m/sec
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