The Function Gives the Number of Days It Would

Multiple Choice

The function gives the number of days it would take two construction crews, working together, to frame a house that crew 1 (working alone) could complete in t days and crew 2 (working alone) could complete in days. If crew 2 could frame a certain house in 20 days, how long would it take both crews working together? Round the answer to the nearest tenth.

A) 10.7 days
B) 1.7 days
C) 12.2 days
D) 9.2 days