Problem page jessica's boat has a top speed of 6 miles per hour in still water. while traveling on a river at top speed, she went 10 miles upstream in the same amount of time she went 30 miles downstream. find the rate of the river current.

The maximum distance (in nautical miles) that a radio transmitter signal can be sent is represented by the expression 1.23h√, where h is the height (in feet) above the transmitter. estimate the maximum distance x (in nautical miles) between the plane that is receiving the signal and the transmitter. round your answer to the nearest tenth.