Suppose two cars depart from a four-way intersection at the same time, one heading north and the other heading west. The car heading north travels at the steady speed of 40 ft/sec and the car heading west travels at the steady speed of 55 ft/sec.

Find an expression for the distance between the two cars after t seconds. (Round your coefficients to one decimal place as needed.)

Find the distance in miles between the two cars after 3 hours 38 minutes. (Round your answer to one decimal place.)

When are the two cars 1 mile apart? (Round your answer to one decimal place.)