Work and DRT

Working together, DeShawn and Stefan can harvest a field in 6.52 hours. Had he done it alone it would have taken Stefan 16 hours. Find how long it would take DeShawn to do it alone.

• 11 hours

• 13.11 hours

• 13.26 hours

• 14.1 hours

It takes Elisa ten minutes to wax a floor. Bill can wax the same floor in 15 minutes. How long would it take them if they worked together?

• 4.39 minutes

• 5.77 minutes

• 6 minutes

• 7.52 minutes

Working alone, it takes Danielle eight hours to dig a 10 ft by 10 ft hole. Dan can dig the same hole in nine hours. If they

worked together how long would it take them?

• 3.69 hours

• 4.21 hours

• 4.24 hours

• 5.19 hours

A diesel train left Miami and traveled north at an average speed of 80 mph. Sometime later a cattle train left traveling

in the opposite direction with an average speed of 80 mph. After the diesel train had traveled for 13 hours the trains were 2080 mi. apart. How long did the cattle train travel?

• 8 hours

• 10 hours

• 11 hours

• 13 hours

Danielle drove to the town hall and back. The trip there took three hours and the trip back took two hours. What was Danielle's average speed on the trip there if she averaged 75 km/h on the return trip?

• 40 km/h

• 50 km/h

• 55 km/h

• 70 km/h

Mike’s boat goes 12 miles per hour in still water. Find the rate of the current of the river if he can go 21 miles downstream in the same amount of time he can go 15 miles upstream.

• 1 mph

• 2 mph

• 3 mph

• 4 mph

Mary can drive her car 120 miles on a mountain road in the same amount of time it takes to drive 156 miles on the freeway. Find her freeway speed if she can drive 15 miles per hour faster on the freeway than she can drive on a mountain road.

• 55 mph

• 60 mph

• 65 mph

• 70 mph