On a straight path, the two stations A and B are 110 kilometres apart. At 7 a.m., one train departs from A. and moves at a speed of 20 kmph in the direction of B At 8 a.m., another train departs from B. It is travelling at a speed of 25 kmph in the direction of A. When are they going to meet?
A. 9 A.m.
B. 10 a.m.
C. 10.30 a.m.
D. 11 a.m.
Answer:B
On a straight path, the two stations A and B are 110 kilometres apart. At 7 a.m., one train departs from A. and moves at a speed of 20 kmph in the direction of B At 8 a.m., another train departs from B. It is travelling at a speed of 25 kmph in the direction of A. When are they going to meet?
A. 9 A.m. B. 10 a.m. C. 10.30 a.m. D. 11 a.m.
Explanation: Assume they meet at 7 a.m., x hours later.A's distance travelled in x hours equals 20x kilometres.B's distance travelled in (x - 1) hours is 25(x - 1) kilometres.As a result, 20x + 25(x - 1) = 110, implying that 45x = 135 and x = 3.As a result, they convene at 10 a.m.