Question 164399
a bus is traveling at 50 mph then reduces its speed to 40 mph. the 220 mi. trip takes 5 hrs. how long does it travel at each speed? show equation.
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d = rt
t = d/r
x = distance at 50 mph
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t = (x/50) + (220-x)/40 = 5 hours
Multiply thru by 200
4x + 5(220-x) = 1000
-x = -100
x = 100 miles at 50 mph --> 2 hours
--> 120 miles at 40 mph --> 3 hours