A and B borrowed a tractor for 23 days. A ploughed 12 acres per day for a certain number of days and then Bused it to plough 15 acres per day for the remaining days. If they paid Rs 3,000 and Rs 2,000 respectively, for how many days did A use the tractor?
Correct Answer : B
Fortuner, the latest SUV by Toyota Motors, consumes diesel at the rate of litres per km, when driven at the speed of x km per hour. If the cost of diesel is Rs 35 per litre and the driver is paid at the rate of Rs 125 per hour then find the approximate optimal speed (in km per hour) of Fortuner that will minimize the total cost of the round trip of 800kms?
Given that 5x + 12y = 60 find the minimum value of ∫x2 + y2
Given that x, y, z < 0 and x + y + z = −4. Then xy + yz + zx has: