Three runners running around a circular track can complete one revolution in 2, 4 and 5.5 respectively. When will they meet at starting point ?  Choose the correct answer
A) 40 h
B) 44 h
C) 38 h
D) 20 h
E) 22 h

Rationale: time at which they meet at starting point = lcm of 2 , 4 and 5.5 = 44 h answer : b
Answer: B