Question
Train 'A' crosses a pole in 35 seconds and takes 40
seconds to cross a platform that is 120 meters long. Train 'B' is half the length of Train 'A' and takes 30 seconds to cross a 210-meter-long platform. How much time will it take for Train 'A' and Train 'B' to cross each other when they are travelling in opposite directions?Solution
Let the length of train 'A' be 'd' metres. So, distance covered by train 'A' in 35 seconds = 'd' metres And distance covered by train 'A' in 40 seconds = (d + 120) metres So, distance covered by train 'A' in (40 - 35) i.e., 5 seconds = d + 120 - d = 120 metres So, speed of train 'A' = (120/5) = 24 m/s So, length of train 'A' = 24 X 35 = 840 metres Length of train 'B' = (840/2) = 420 metres So, speed of train 'B' = (420 + 210) Ă· 30 = 21 m/s So, time taken by trains 'A' and 'B' to cross each other = (840 + 420) Ă· (24 + 21) = 1260 Ă· 45 = 28 secondsÂ
Who among the following person has least number of laptops?
Six students L, M, N, O, P, and Q scored different marks in an exam. O scored more than Q and L. Three students scored more than P, who scored just mor...
There are 6 members in a family: Ram, Laxman, Bharat, Shatrugan, Sita & Urmila. The Salary of Sita is more than only one person. Ram has highest salary...
How many laptops are cheaper than B?
Who among the following has maximum laptops?
Who is the second heaviest person?
Srikant is shorter than Raju. Anuj is taller than Srikant. Vipin is taller than Raju but shorter than Rakesh. Raju is taller than Anuj who will be in th...
How many persons are heavier than I?
W is taller than K who is shorter than U. O is taller than D but shorter than K. U is shorter than W. Who is the tallest?
Diwakar is elder than Srikant. Suman is elder than Srikant but younger than Diwakar. Dheeraj is younger than both Srikant and Gagan but Gagan is younger...