1.Three computers can print out a task in 10 min, 15 min, and 30 min, respectively. How long would it take to complete the task with all three computers working?  min   2.An engineer traveled 110 mi by car and then an additional 750 mi by plane. The rate of the plane was three times the rate of the car. The total trip took 8 h. Find the rate of the car.

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