MBA Exam

At his normal speed, Shirish can travel 18 km downstream in a fast flowing stream in 9 hours less than what he takes to travel the same distance upstream. The downstream trip would take 1 hour less than what the upstream trip would take provided he doubles his rate of rowing. What is the speed of the stream in km/hr?

1) 20/3
2) 8
3) 33/4
4) None of these

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MBA Other Question
If the sum to infinity of the series 2 + (2 - d)2/3 + (2 + d) 4/9 + (2+ 3d) 8/27 + D.. is 5/2, what is the value of d?(1) 7/12 (2) -7/12 (3) -5/12 (4) 5/12

1) 7/12
2) -7/12
3) -5/12
4) 5/12
 (2) 10% of salty sea water contained in a flask was poured out into a beaker.After this, a part of the water contained in the beaker was vapourised by heatingand due to this, the percentage of salt in the beaker increased M times. If it is known that after the content of the beaker was poured into the flask, the percentage of salt in the flask increased by x%,find the original quantity of sea water in the flask....(No options available....if neone is able to solve it,please come with an explanation)