MBA Exam

The rate of consumption of electricity by a metro train varies as the square of its speed (in km/hr). Consumption of electricity is 1000 kw/hour when the speed of the metro train is 40 km/hr. All other costs to run the metro train is Rs. 12 per hour. If the cost of electricity is Rs. 15 per 100 kw-hour, then of the following which is the speed (in km/hr) at which the train can run such that the total cost of running the train per kilometer is Rs. 7.65?

1) 80
2) 90
3) 60
4) 180
5) 120

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MBA Other Question
In a survey of political preferences, 78% of those asked were in favour of at least one of the proposals: I, II and III. 50% of those asked favoured proposal I, 30% favoured proposal II and 20% favoured proposal III. If 5% of those asked favoured all three of the proposals, what percentage of those asked favoured more than one of the three proposals? [1999] plzz explain

1) 10
2) 17
3) 12
4) 22
 p,q and r are successive even positive integers in the ascending order.4 times r is 4 times more than 5 times p.what is the value of q?pl. provide sol.

1) 12
2) 14
3) 16
4) 10