Question
Train B whose length is (l+40) metre can cross a pole in
20 seconds. Train A can cross 168 metre long platform in 44 seconds. The length of train A is 80 metre less than that of train B. If the speed of train A is 10 m/s less than that of train B, then find out the value of ‘l’.Solution
If the speed of train A is 10 m/s less than that of train B. Let’s assume the speed of train A is ‘y’ m/s. y = (speed of train B) - 10 speed of train B = (y+10) m/s Train B whose length is (l+40) metre can cross a pole in 20 seconds. (y+10) = (l+40)/20 20(y+10) = (l+40) 20y+200 = (l+40) 20y = (l+40)-200 20y = (l-160) y = (l-160)/20  Eq.(i) The length of train A is 80 metre less than that of train B. length of train A = (l+40)-80 = (l-40) metre Train A can cross 168 metre long platform in 44 seconds. [(l-40)+168]/44 = y  Eq.(ii) Eq.(i) = Eq.(ii) (l-160)/20 = [(l-40)+168]/44 (l-160)/5 = [(l-40)+168]/11 11l-1760 = 5l-200+840 11l-1760 = 5l+640 11l-5l = 640+1760 6l = 2400 Value of ‘l’ = 400
Which of the following can cause a Tsunami?
Where will the first IIT campus outside India be established to expand the reach of the Indian Institutes of Technology (IITs)?
How many biosphere reserves are there in India?
Among the following options, which country is considered an emerging market economy in Europe?
President of India is empowered to make which of the following appointments?
A. Chief of the Army
B. Speaker of the Lok Sabha
C. Ch...
With which of the following companies has ISRO collaborated with to strengthen research and development of NaviC messaging service?
How many members are nominated by the President to the Rajya Sabha?
The ages of Mr. Kumar and his son are in the ratio 5:3. Fifteen years back this ratio was 2 :1. What was the age (in years) of Mr. Kumar when his son wa...
With which financial institution did the Indian Renewable Energy Development Agency Ltd. (IREDA) sign a Memorandum of Understanding (MoU) for advancing ...
Article _______ of the Indian constitution provides for superintendence, direction and control of elections vested in an Election commission