Question

Person 1 writes internal operating procedures 2 times faster than Person 2. Most of the procedures took 45 minutes each to create, but two of Person 1's procedures took 2 hours each. Calculate how long it took Person 1 to complete 9 procedures.

Answer 1

Answer:

$\boxed{\text{6 h 37.5 min}}$

Step-by-step explanation:

P2 takes 45 min/procedure

P1 takes 22.5 min/procedure

For nine procedures,

$\text{Time} = \text{7 procedures} \times \dfrac{\text{22.5 min}}{\text{1 procedure}} + \text{2 procedures} \times \dfrac{\text{120 min}}{\text{1 procedure}}\\\\= \text{157.5 min + 240 min} = \text{397.5 min} =\textbf{6 h 37.5 min}\\\\\text{It took P1 \boxed{\textbf{6 h 37.5 min}} to complete nine procedures}$