Places A and B are 396 km apart. Train X leaves from A for B and trai…

Question

Places A and B are 396 km apart. Train X leaves from A for B and train Y leaves from B for A at the same time on the same day on parallel tracks. Both trains meet after 51/2 hours. The speed of Y is 10 km/h more than th…

Accepted Answer

Option A. 41. Answer & Solution Answer: Option A Solution: $$A \,\,\,\,\,\,\,\,\,\,396\,\,\,\,\,\,\,\,\,\,B$$ & 396A + B = 112 & X + Y = 396 × 211 & X + Y = 36 × 2 & X + Y = 72 & Let, & X = a & Y = a + 10 & a + a + 10 = 72 & 2a = 62 & a = 31 km/h & Y = 31 + 10 = 41

Places A and B are 396 km apart. Train X leaves from A for B and train Y leaves from B for A at the same time on the same day on parallel tracks. Both trains meet after 51/2 hours. The speed of Y is 10 km/h more than that of X. What is the speed (in km/h) of Y?

Solution