Question
Train A running at speed of 54 km/hr crosses a platform
having twice the length of train in 12 sec. Train B whose length is 240m crosses same platform in 18 sec, then find the speed of train B ?Solution
Let length of train A = x Length of platform = 2x Speed = distance/time ⇒ 54 x 5/18 = (x + 2x)/12 ⇒ x = 60 m = length of train A Length of platform = 60 x 2 = 120m For train B, Speed = distance/time ⇒ (240 + 120)/18 x (18/5) ⇒ 72 km/hrÂ
Who among the following was the Chairman of the Working Group for determining the methodology for construction of Producer Price Index (PPI) in India (...
If the ratio of speeds of 'A' and 'B' is 5: 6 and 'B' allows 'A' a start of 70 metres in a 1.2 km race, who will win the race and by what distance?
The sides of a rectangle are in the ratio 8 : 10 and its perimeter is 90 cm. The area of this rectangle is:
Which one of the following statements regarding force is correct?
In which year is the ratio of foreign investment approvals to foreign investment inflows highest?
Which of the following is/are correct about the procedure of a strike?
I.        Issue of notice of strike is mandatory.
II....
Which state witnessed the foundation stone-laying ceremony of India's first Digital Science Park by Prime Minister Modi?
If ‘+’ means ‘–‘,‘–‘ means ‘÷’, ‘÷’ means ‘×’ and ‘×’ means ‘+’, what will come in place of the question mark (?...
Which one number among the numbers given in options will come in the place of question mark (?) in the series given below ?
17, 27, 38, 50, 63, ?
The average weight of 8 students in a class is 35 kg. If the weight of 4 teachers is also included, then the new average weight of each person (teacher ...