1. They will meet as 7:20 PM
Step-by-step explanation: The first friend runs at a speed of 8 miles per hour.
The second friend runs at a speed of 7 miles per hour.
they left at 6 p.m.
their houses are 20 miles apart,
Since they are running towards each other the effective speed will be
(8+7) = 15 mph
Distance = 20 miles
time they run = 20/15 =4/3 hours
They will meet at 7:20 pm
2. 0
3. 4/5 second
explanation: The time = 4 / {17-12} = 4/5 second