Question: the racing magic takes 60 seconds to circle the racing track once . the charging bull makes 40 rounds of the track in an hour . if they left the starting point together , how many minutes will it take for them to meet at the starting point for the second time ?
A) 3
B) 6
C) 9
D) 12
E) 15
Correct answer: B
Grade: 7 | Topic: Number System | Difficulty: Medium | Standard: 6.NS.B.4