Question: a and b go around a circular track of length 100 m on a cycle at speeds of 18 kmph and 36 kmph . after how much time will they meet for the first time at the starting point ?
A) 120 sec
B) 198 sec
C) 178 sec
D) 665 sec
E) 20 sec
Correct answer: e
Grade: 6 | Topic: Ratios and proportions | Difficulty: Hard | Standard: 6.RP.A.3b