Quantitative Aptitude - Arithmetic Ability Questions

At what time between 4 o'clock and 5 o'clock will the two hands of the clock be at the right angle to each other for the first time?

There were 42 students in a hostel. Due to the admission of 13 new students, the expenses of the mess increase by Rs. 30 per day while the average expenditure per head diminished by Rs. 3. What was the original expenditure of the mess ?

If Cosec θ = 25/7 , then what is the value of Cot θ?

To cover a distance of 216 km in 3.2 hours, what should be the average speed of the car in meters/second?

One tap can fill a water tank in 50 mins and another tap can make the filled tank empty in 75 mins. If both the taps are open together, already half filled tank would be full in

70% of the cost price of a article is equal to the 40% of its selling price. What is the profit or loss percentage?

A trader had 630 kgs of rice. He sold a part of it at 15% profit and the rest at 8% profit, so that he made a total profit of 12%. How much rice (in kgs) did he sell at 8% profit?

After repairing a scooter runs at a speed of 54 km/h and before repairing runs at speed of 48 km/h. It covers a certain distance in 6 hours after repairing. How much time will it take to cover the same distance before repairing?