a and b are two bus stations 400 km apart. if two separate buses depart from both stations and travel towards each other, at what time do they meet each other given that the first bus left at 8 am and travels at a speed of 70 km/hr while the second bus left at 9 am and travels at a speed of 40 km/hr.  Pick one
A) 12 p.m  B) 2 p.m  C) 1 p.m  D) 10 p.m  E) 2.20 p.m
Suppose they meet x hours after 8 a.m.   Distance moved by first BUS in x hours + distance moved by 2nd BUS in x-1 hrs = 400   70x+40(x-1) = 400   70x+40x-40= 400   110x= 440   x = 4   So they meet 4 hr after 8 a.m. is at 12 p.m.   12 p.mnswer is 12 p.m
<result>A</result>
a and b are two bus stations 400 km apart. if two separate buses depart from both stations and travel towards each other, at what time do they meet each other given that the first bus left at 8 am and travels at a speed of 70 km/hr while the second bus left at 9 am and travels at a speed of 40 km/hr.