Question
A train travelling at the speed of 72 km/hr crosses
another train, having 20 meters less length and travelling in opposite direction at the speed of 54 km/hr in 6 seconds. If the longer train crosses a platform in 16 seconds, then the shorter train will cross the same platform in how many seconds?Solution
Speed of longer train = 72 × (5/18) = 20 m/s
Speed of shorter train = 54 × (5/18) = 15 m/s
Let length of longer and shorter trains be ‘L’ meters and (L – 20) metres, respectively.
According to question,
L + L – 20 = (20 + 15) × 6 = 210
2L – 20 = 210
L = 115 metres
So, L – 20 = 95 metres
Let length of platform is ‘P’ metres
So, P + 115 = 20 × 16 = 320
P = 320 – 115 = 205 meters
Desired time = (205 + 95)/15 = 300/15 = 20 seconds
Which Article of the Constitution of India grants power to the President to appoint Judges of the Supreme Court?
In which year was the Khalsa tradition initiated?
 Who has been reappointed as solicitor general of India in July 2020?
Abhishek, Bobby and Charlie start from the same point and travel in the same direction round an Island 6 km in circumference. Abhishek travels at the ra...
Where will India and the USA be co-hosting the Global Entrepreneurship Summit in November 2017?
1050 ÷ 25 × 51 – 1942 = ?
The Buddha belonged to a small gana known as ______.
Which small finance bank recently merged with North East Small Finance Bank?
In which of the following cases the Supreme Court, while laying out the ‘basic structure’ of the Constitution held that the democratic character of ...
Sree Narayana Guru considered the differences based on caste and religion as meaningless and advocated the principle of ‘One Caste, one Religion and o...
