A limousine chauffeur is going to take a guest from the hotel to the airport. To catch the flight, the chauffeur has to arrive at the airport in 30 min. There are two routes to the airport: a local route and the highway. The chauffeur has found that it always takes him 25 min to get to the airport when he takes the local route. When he takes the highway, the time consumed depends on the traffic. When the highway is jammed, it takes him 36 min to get to the airport.

When the highway is clear, the trip takes only 10 min. There is a.10 probability that the highway will be jammed.

(a) Which route should the chauffeur take on the way to the airport?

(b) Which way should the chauffeur take when he is coming back to the hotel?