a and b are two bus stations 400 km apart. if two separate buses depart from both stations and ...
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.
Answer/Solution
12 p.m
Steps/Work
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.
Answer is A
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.
Answer is A