Answer: 924 feet
Explanation:
First, let's convert the unit of miles/hour to feet/second. Let's start with miles.
1 mile = 5280 feet
126 miles * 5280 feet = 665,280 feet
1 hour = 3660 seconds
126 mi/hr = 665280 ft/3600 sec = 184.4 ft/sec
The parachutist fell for 5 seconds, so multiply 184.4 ft/sec by 5.
184.4 * 5 = 924
The parachutist fell 924 feet in 5 seconds at a rate of 184.4 ft/sec.