A plan flies a distance of 1800 km in 5 hours. What is its average speed in meters/second?

A can paint a house in 55 days and B can do it 66 days. Along with C, they did the job in 12 days only. Then, C alone can do the job in how many days?

In ΔPQR , ∠R=54° the perpendicular bisector of PQ at S meets QR at T. If ∠TPR =46°, then what value of (in degree) ∠PQR?

A dealer is selling an article at a discount of 5 % on the marked price. If the marked price is 12% above the cost price and the article was sold for ₹ 532 then the cost price is (in ₹)

The value of sec⁴ A (1 – sin⁴A) – 2tan²A is: 

if $$x=\sqrt {64}+\sqrt {121}-\sqrt {169}$$, the find the value of x²

5-[4-{3-(3-3-6)}] is equal to:

ΔABC is an equilateral triangle in which D, E and F are the points on sides BC, AC and AB, respectively, such that AD ⊥ BC, BE ⊥ AC and CF ⊥ AB. Which of the following is true?