Problema Solution
A bus travels 15mph, another bus travels 75mph opposite direction, both leave station at 10:00am. What time will they be 780miles apart.?
Answer provided by our tutors
Let
v1 = 15 mph the speed of the first bus
v2 = 75 mph the speed of the second bus
d = 780 mi the sum of the distances that each bus passes
t = the time of the travel
Using the formula distance = time*speed we have:
v1t + v2t = d
15t + 75t = 780
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click here to see the equation solved for t
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t = 26/3 hr
t = 8 hr 2*60/3 min
t = 8 hr 40 min
8 hours and 40 min after 10:00 am is 6:40 pm.
At 6:40 pm the buses are 780 miles apart.