A train 200 m long running at 36 kmph takes 55 seconds to cross a bridge. Length of the bridge is

If the difference between the roots of the equation Ax²+BX+C = 0 is 4, then which of the following is TRUE?

What approximate value will come in place of the question mark (?) in the following questions?

324.995 x 15.98 ÷ 4.002 + 36.88 =? 

Find measure of central angle of the arc whose length is 22 cm and radius of the circle is 28 cm?

The ratio of the age of a son and father is 1: 4. After 9 years, the ratio will be 2: 5. What is the present age (in years) of the son?

30 dozen walnuts were purchased for Rs. 14400 and 32 packets of walnuts (20 walnuts in each packet) were purchased for Rs. 57600. If a packet of Akharato was sold for five rupees in a pack at Rs. 432, what would be the profit percentage?

What will come in place of question mark(?) in the following number series?
10, 14, 25, 55, 140 (?)

A dealer bought an item at 10% discount on its original price. He sold it  at 35 % more than the original price. What percentage profit did he get?