Question
A train running at 90 km/h takes 18 seconds to pass a pole.
Find the approximate time required for the train to cross a platform that is 0.8 times the length of the train.Solution
ATQ,
Length of the train = (90 × (5/18) × 18) = 450 metres
Length of the platform = (450 × 0.8) = 360 metres
Time taken by train to cross the platform = [(450 + 360) / (90 × (5/18))]= (810 / 25) = 32.4 seconds
A ball is thrown from a height of 900 m on the ground. It bounces (2/3) times of its every last bounce. Find the total distance covered by the ball ti...
If A and B are two sets such that the number of elements in A is 20, a number of elements in B is 18 and the number of elements in both A and B is 10, f...
Find the mode of the following data:
6,15,18,6,18,11,23,22,6,18,15,22,12
Find the mode of the data: 2, 2, 3, 5, 15, 15, 15, 20, 21, 23, 25, 15, 23, 25.
Between 3 and 96, three numbers are inserted to form a GP. Find the second inserted term.
Find the mode of the following data:
The fourth term of an arithmetic progression is 6. Then the sum of first seven terms is:
The expenditure-to-savings ratio of an individual 'P' is 5:4. If the person's income rises by 25% and their savings increase by 3...
21 is divided into three parts which are in arithmetic progression (A.P.) in such a way that the sum of their square is 179. Find the smallest part.
If 5th term of an AP is 20 and 10th term is 45, find 25th term.
