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He uses the bus 70% of the time and 30% of the time he takes the...

He uses the bus 70% of the time and 30% of the time he takes the urban train.

Juan goes to work in the bus or in train. When he goes on the bus, he gets to work on time 60% of the time.

When he takes the commuter train, he is on time for work 90% of the time.

What is the probability that he will be on time for work?
Math   Statistics-And-Probability   
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