A racing car going at an average speed of 108 km/ hr takes 15 minutes to complete a lap on a racing track. By how much should it increase its speed (in km/hr) to complete the lap in 12 minutes?

In an election between two candidates, 75% of the voters cast their votes, out of which 2% votes were declared invalid. A candidate got 9261 votes which were 75% of the valid votes. The total number of voters enrolled in that election was:

If a : b = 7 : 9 and b : c = 5 : 7, then what is a : c ?

A rod of length 85 m is divided into two parts if the first part of the rod is 2/3 of the second part then the larger part (in metres) is.

A tank is fitted with two taps. The first tap can fill the tank completely in 45 minutes and the second tap can empty the full tank in one hour. If both the taps are opened alternately for one minute, then in how many hours the empty tank will be filled completely?

A bank offers 20% compound interest per half year. A customer deposits Rs 7600 each on 1^st January and 1^st July of a year. At the end of the year, the amount he would have gained from interest is –

A and B enter into partnership in vesting ₹ 48,000 and ₹ 60,000 respectively. After 3 months, A withdraws ₹ 8,000 while B invests 6,000 after 6 months of starting of business. Out of the total amount of profit, if A gets ₹ 12, 000 as his share at the end of the year total profit is: