answer please

Every morning before your first class, you line up at Tim Horton's on the BCIT campus. You notice that it takes between 15 to 29 minutes to get through the lineup, give your order to the cashier, and receive your coffee, donut, and wrap. The time to get your order follows a uniform distribution. (a) What is the probability that it will take at least 20 minutes to get your order? (enter a number between 0 and 1 in 4 decimal places) 0.6428 (b) You arrive at Tim Horton's at 8:00 am. What is the probability that you receive your order before your friends show up at 8:25 am at Tim's? (enter a number between 0 and 1 in 4 decimal places) 0.7142 (c) 20% of the time it takes you longer than how many minutes to get your order? (answer in 2 decimal places) min