The distance between city A and city B is equal to the same number of kilometers as the greatest common divisor of 780 and 330. What was the speed of a traveller who walked that distance in 6 hours?
There are dragons: red and green. If the red dragon had 6 heads more than the green dragon, both of them would have 34 heads altogrther. But in fact, the red dragon has 6 heads less than the green dragon. How many heads has the red dragon got?
Jaś needs 10 minutes to eat a pizza and Małgosia needs 15 minutes. How long does it take for both of them to eat pizza together?
A 200 m long train goes through a 200 m long tunnel at 200 km/h. How long does it take for the train to get through the tunnel?
