Abby’s bus left at 2:00, going southbound at 55 mph. Bob’s went northbound starting at 3:00, going only 45 mph. How long will it take for them to get 420 miles apart?
Round to the nearest tenth if necessary.
4.7 hours
4.2 hours
3.2 hours
3.6 hours

Question

Abby’s bus left at 2:00, going southbound at 55 mph. Bob’s went northbound starting at 3:00, going only 45 mph. How long will it take for them to get 420 miles apart?
Round to the nearest tenth if necessary.  
    4.7 hours  
   4.2 hours  
   3.2 hours  
   3.6 hours

anonymous · Answer

Relative velocity is (55+45)=100mph Now try it from here on

anonymous · Answer

distance = velocity * time

time = distance/velocity

t = 420/100

anonymous · Answer

Solve the following for t: 
(55 t + 55) + 45 t = 420
t=73/20 or 3.62 hours

anonymous · Answer

Solve the following for t: 
(55 t + 55) + 45 t = 420
t=73/20 or 3.62 hours