The driver of an ambulance sees a school bus 40 m ahead of him. After 20 second, the school bus is 60 metre behind. If the speed of the ambulance is 30 km/h, what is the speed of the school bus?

1)10 km/h

2)12 km/h

3)15 km/h

4)22 km/h

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    12 km/h

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