A, B and C start together from the same place to walk round a circular path of length 12km. A walks at the rate of 4 km/h, B 3 km/h and C 3/2 km/h. They will meet together at the starting place at the end of:

Answer: Option D

Time taken to complete the revolution:
A → $$\frac{12}{4}$$ = 3 hours
B → $$\frac{12}{3}$$ = 4 hours
C → 12 × $$\frac{2}{3}$$ = 8 hours
Required time,
= LCM of 3, 4, 8.
= 24 hours.