Question
200 metre long train lsquo;Arsquo; is running with a
speed of 72 km/hr. Train lsquo;Brsquo; which is 290 metre long is running with a speed of 90 km/h in opposite direction of train lsquo;Arsquo;. For how much time, the smaller train is completely obscured by the larger train when they cross each other?Solution
Length of smaller train = 200 metre Speed of smaller train = 72 times; (5/18) = 20 m/s Length of bigger train = 290 metres Speed of bigger train = 90 times; (5/18) = 25 m/s Since, the smaller train is completely obscured by larger train, therefore, extra length of larger train = 290 ndash; 200 = 90 metres Relative speed of trains lsquo;Arsquo; and lsquo;B lsquo;= 20 + 25 = 45 m/s (Since, the trains are running in opposite direction) Required time = 90/45 = 2 second
Twin prime numbers are the prime numbers whose difference is always equal to 2. The number of twin primes between 35 and 100 is:
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A man spends 1/7 of his income on food, 3/5 of his income house rent and 1/4 of his income on clothes. If he still has Rs. 200 left with him, his income...
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13, 14, 12, 15, 11, 16, 19, 10, 20, 18, 17 - The smallest positive integer 'R' which when divided by 9, 18, and 27 leaves 6 as the remainder in each case. Find the value of ('7R' - 20).
15Â Â Â Â Â Â Â Â Â Â 15Â Â Â Â Â Â Â Â Â Â 60Â Â Â Â Â Â Â Â Â Â 540Â Â Â Â Â Â Â Â 8650
...How many times I write digit ‘1’ in first hundred natural numbers?Â
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