Out of 500 car owners investigated, 400 owned car A and 200 owned car B, 50 owned both A and B cars. Is this data correct?

A car travelling at a speed of 54 km/hr towards a large wall horns a sound of frequency 400 Hz if the person stands behind the car such that the car receding from him approaches the wall the difference in frequencies of the two sounds one recieved directly from the car and the other reflected from the wall (speed of sound is 335 m/s)

A car makes a displacement of 100 m towards east and then 200 m towards north. Find the magnitude and direction of the resultant.

A pre-owned car show room owner bought a second hand car for ₹1,50,000. He spent ₹20,000 on repairs and painting, then sold it for ₹2,00,000, Find whether he gets profit or loss. If so, what percent?

Places A and B are 150 km apart on a highway. One car starts from A and another from B at the same time at different speeds. If the cars travel in the same direction, they meet in 6 hours. If they travel towards each other, they meet in 2 hours. What are the speeds of the two cars?