Question : A car starts from point A towards point B, travelling at the speed of 20 km/hr. $1\frac{1}{2}$ hours later, another car starts from the point and travels at the speed of 30 km/hr and reaches $2\frac{1}{2}$ hours before the first car. Find the distance between A and B.

Question : Amita travels from her house at $3 \frac{1}{2}$ km/hr and reaches her school 6 minutes late. The next day she travels at $4 \frac{1}{2}$ km/hr and reaches her school 10 minutes early. What is the distance between her house and the school?

Question : A man travels $\frac{3}{4}$th of the distance of his journey by bus, $\frac{1}{6}$th by rickshaw and the remaining 2 km on foot. The total distance travelled by the man is:

Question : A person travels 600 km by train at 80 km/hr, 800 km by ship at 40 km/hr, 500 km by aeroplane at 400 km/hr, and 100 km by car at 50 km/hr. What is the average speed for the entire distance?

Question : A man travels 50 km at 25 km/hr, the next 40 km at 20 km/hr, and then 90 km at 15 km/hr. His average speed is: