Speed= | 60 x | 5 | m/sec | = | 50 | m/sec. | ||
18 | 3 |
Length of the train = (Speed x Time).
Length of the train = | 50 | x 9 | m = 150 m. | |
3 |
Speed of the train relative to man = | 125 | m/sec | |
10 |
= | 25 | m/sec. | |
2 |
= | 25 | x | 18 | km/hr | |
2 | 5 |
= 45 km/hr.
Let the speed of the train be x km/hr. Then, relative speed = (x - 5) km/hr.
x - 5 = 45 x = 50 km/hr.
Let the rectangle has x and y tiles along its length and breadth respectively.
The number of white tiles
W = 2x + 2(y – 2) = 2 (x + y – 2)
And the number of red tiles = R = xy – 2 (x + y – 2)
Given that the number of white tiles is the same as the number of red tiles
⇒ 2 (x + y – 2) = xy – 2 (x + y – 2)
⇒ 4 (x + y – 2) = xy
⇒ xy – 4x – 4y = –8
⇒ (x – 4) (y – 4) = 8 = 8 ×1 or 4 × 2
⇒m – 4 = 8 or 4 ⇒m = 12 or 8
Therefore.the number of tiles along one edge of the floor can be 12