If all the cars follow the police order, what is the difference in travel time (in minutes) between a car which takes the route A-N-B and a car that the route A-M-B?

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Solution

The correct option is B
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Travel time per car for A-N-B route considering 2 cars travelling through that route = 6 + 3 + 20 + 0.9 = 29.9 minutes
Travel time per car for A-M-B route considering 2 cars travelling through that route = 20 + 1 + 6 + 3 = 30 minutes
Difference in travel time per car between routes A-N-B and A-M-B = 30 - 29.9 = 0.1 minute.

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