The distance between two cities A and B is 330 km. A train starts from A at 8 am and travels towards B at 60 km/hr. Another train starts from B at 9 am and travels towards A at 75 km/hr. At what time do they meet ?
A. 10.00 am
B. 10.30 am
C. 11.00 am
D. 11.30 am
Answer: Option C
Solution(By Examveda Team)
Time = $$\frac{270}{60 + 75}$$
Time = 2 hours
So, time at which they meet = 11.00 am
Alternate
Assume that they meet x hours after 8 am
Then,
Train 1, starting from A, travels x hours till the trains meet
Distance travelled by train 1 in x hours = 60x km
Train 2, starting from B, travels (x - 1) hours till the trains meet
Distance travelled by train 2 in (x - 1)hours = 75(x - 1) km
Total distance travelled
= Distance travelled by train 1 + Distance travelled by train 2
⇒ 330 = 60x + 75(x -1)
⇒ 12x + 15(x - 1) = 66
⇒ 12x + 15x - 15 = 66
⇒ 27x = 66 + 15 = 81
⇒ 3x = 9
⇒ x = 3
Hence, the trains meet 3 hours after 8 am, i.e. at 11 am
Related Questions on Speed Time and Distance
A. 48 min.
B. 60 min.
C. 42 min.
D. 62 min.
E. 66 min.
A. 262.4 km
B. 260 km
C. 283.33 km
D. 275 km
E. None of these
A. 4 hours
B. 4 hours 30 min.
C. 4 hours 45 min.
D. 5 hours
Join The Discussion