A vessel contains equal volumes of $ \text{S}{{\text{O}}_{\text{2}}} $ and $ \text{C}{{\text{H}}_{4}}. $ Through a small hole the gases effused into vacuum. After 200 seconds the total volume is reduced to half. What is the ratio of $ \text{S}{{\text{O}}_{\text{2}}} $ and $ \text{C}{{\text{H}}_{\text{4}}} $ remaining in the vessel?