A train and a plane both leave at the same time to travel to a
city that is 360 miles away. The plane travels three times as fast as the train. The plane
arrives 4 hours before the train. How fast is the train?

Asix-sided die of unknown bias is rolled 20 times, and the number 3 comes up 6 times. in the next three rounds (the die is rolled 20 times in each round), the number 3 comes up 6 times, 5 times, and 7 times. the experimental probability of rolling a 3 is 10 %, which is approximately % more than its theoretical probability. (round off your answers to the nearest integer.)