#### An aeroplane flying with a wind of 30 km/hr takes 40 minutes less to fly 3600 km than what it would have taken to fly against the same wind. Find the plane’s speed of flying in still air.

**Solution:**

#### A school bus transported an excursion party to a picnic spot 150 km away. While returning, it was raining and the bus had to reduce its speed by 5 km/hr, and it took one hour longer to make the return trip. Find the time taken to return.

**Solution:**

**More Solutions:**

- Which of the following is a quadratic equation.
- If 1/2 is a root of the equation.
- The roots of the equation x2 – 3x – 10 = 0.
- If the equation 2x² – 5x + (k + 3) = 0 has equal roots
- If the equation 3x² – kx + 2k =0 roots.
- If the equation 2x² – 6x + p = 0 has real.
- Which of the following equations has no real roots.