Question

Homework

1. An airplane can fly with the wind a distance of 800 miles in 8 hours. However, the return trip against the wind takes 10 hours. Find the speed of the plane in still air and the speed of the wind

speed of the plane in still air _____ mph

speed of the wind _____ mph

2. During one month, a homeowner used 500 units of electricity and 100 units of gas for a total cost of $343. The next month, 300 units of electricity and 250 units of gas were used for a total cost of $278. Find the cost per unit of gas.

$ _____________

3. A merchant mixed 10 lb of a cinnamon tea with 6 lb of spice tea. The 16-pound mixture cost $27. A second mixture included 12 lb of the cinnamon tea and 8 lb of the spice tea. The 20-pound mixture cost $34. Find the cost per pound of the cinnamon tea and of the spice tea.

cinnamon _______ dollars per pound

spice _________ dollars per pound