1.

The driver of an ambulance sees a bus 40 m ahead of him, after 20 seconds, the bus is 60 meter behind. If the speed of the ambulance is 30 km/h what is the speed of the bus?

A. 10 km/h
B. 12 km/h
C. 15 km/h
D. 22 km/h
Answer» C. 15 km/h


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