Train P crosses a pole in 30 seconds and train Q crosses the same pole

1.	Train P crosses a pole in 30 seconds and train Q crosses the same pole in one minute and 15 seconds. The length of train P is three-fourths the length of train Q. What is the ratio of the speed of tra
Answer» 15 : 8 Given that train P crosses a pole in 30 SECONDS and train Q crosses the same pole in one minute and 15 seconds. Let the LENGTH of train P be LP and that of train Q be LQ given that LP = 3/4 LQ As the train P and Q crosses the pole in 30 seconds and 75 seconds respectively, => Speed of train P = VP = LP/30 Speed of train Q = VQ = LQ/75 LP = 3/4 LQ => VP = 3/4 LQ/(30) = LQ/40 RATIO of their speeds = VP : VQ = LQ/40 : LQ/75 => 1/40 : 1/75 = 15 : 8

Train P crosses a pole in 30 seconds and train Q crosses the same pole in one minute and 15 seconds. The length of train P is three-fourths the length of train Q. What is the ratio of the speed of tra

Answer»

15 : 8

Given that train P crosses a pole in 30 SECONDS and train Q crosses the same pole in one minute and 15 seconds.

Let the LENGTH of train P be LP and that of train Q be LQ

given that LP = 3/4 LQ

As the train P and Q crosses the pole in 30 seconds and 75 seconds respectively,

=> Speed of train P = VP = LP/30

Speed of train Q = VQ = LQ/75

LP = 3/4 LQ

=> VP = 3/4 LQ/(30) = LQ/40

RATIO of their speeds = VP : VQ

= LQ/40 : LQ/75 => 1/40 : 1/75 = 15 : 8