Question
A train can cross a pole, a bridge of 720 meter long and
platform of 640 meter long in 9 seconds, _____ seconds and 25 seconds, respectively. The value given in which of the following option will fill the blank to make the above statement true:Solution
Let the length of the train = x meter So according to question: x/9 = (x + 640)/25 25x = 9x + 5760 16x = 5760 x = 360 So the length of the train = 360 m Speed of the train = 360/9 = 40 m/s Time taken by the train to cross a bridge 720 meter long = (360 + 720)/40 = 1080/40 = 27 seconds
More Algebra Questions
41.66% of 888 + 66.66% of 1176 = ?2 - 4√ 16 Â
Evaluate: 320 − {18 + 4 × (21 − 9)}
Simplify: 72 ÷ 6 × 3 − 8 + 4
118 × 6 + 13 + 83 = ?
Simplify the following expression:
  (400 +175) ² - (400 – 175) ² / (400 × 175)
150% of 850 ÷ 25 – 25 = ?% of (39312 ÷ 1512)
(75 + 0.25 × 10) × 4 = ?2 - 14
26% of 650 + 15% of 660 – 26% of 450 = ?
115% of 40 + 3 × 4 = ? × 11 – 8
