Find the ratio between the area of the in-circle and the

A boat can travel at a speed of 15 km/h in still water. If the speed of the current is 3 km/h, how long will it take to travel 24 km upstream?

If log₁₀(x² − 1) = log₁₀(4x − 3), find x.

Find the simple interest on Rs 1040 at 12% per annum for 2 years? 

Find the greatest 3-digit number which when divided by 11 or 14 leaves a remainder of 3.

The equation∣ z-2i ∣ + ∣ z + 2i ∣ = 6 represents:

A gave 30% of amount to B. B gave 20% of amount received from A to C. If amount received by C from B is Rs.192, then find the amount received by B from A.

If sets A and B contain 4 and 5 elements respectively, then the total number of binary relations from A to B is:

159, 303, 499, 755, 1079, ?