Discussion

Explanation:

The police department would ask 2 cars to take the A-N-B route and 2 cars to take the A-M-B route, because 2 cars taking each of these routes would minimize the time for each of the 4 cars.

2 cars taking A-M-B route – 9 + 20.9 = 29.9 minutes.

2 cars taking A-N-B route – 21 + 9 = 30 minutes.

Increasing to 3 cars on the A-M-B would increase travel time of each car by 4.8 minutes and increasing to 3 cars on the A-N-B route would increase travel time of each car by 4 minutes. So 2 cars would take the A-N-B route.

Answer: 2

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