202.Tim and Elan are 90km away from each other .they are starting to move towards each other simultaneously ,tim at speed 10kmph and elect at 5kmph ,if every hr they double the speed ,what is distance that tim will pass until he meets elan? [TCS-2012]
(A)45 (B)60 (C)20 (D)80
Below given are two formulae for long summation.
1) 1 + 2 + 3 + 4 + ................ + n = n(n+1)/2
2) 1^2 + 2^2 + 3^2 + 4^2 + ........ + n^2 = 1/6 n(n+1)(2n+1)
The value of
(1% of 2 + 2% of 3 + 3% of 4 + ........ + 99% of 100) will be