The task is to generate the correct answer for a given math problem.

Problem: the average weight of a group of boys is 30 kg . after a boy of weight 45 kg joins the group , the average weight of the group goes up by 1 kg . find the number of boys in the group originally ?
14

Problem: during a certain season , a team won 70 percent of its first 100 games and 50 percent of its remaining games . if the team won 70 percent of its games for the entire season , what was the total number of games that the team played ?
10

Problem: a person crosses a 1080 m long street in 12 minutes . what is his speed in km per hour ?

5.4