A tractor has a permissible loaded speed of 200 m/ minute, which can increase by 25% when the load is removed/deposited. Generally, it is operated at 80% of the permissible speed (loaded or unloaded). It works at a location where haul distance is 120 m. Rest allowance per round- trip is taken as 50 seconds on an average. Fixed time per trip, for loading and unloading and turnaround, etc., is 30 seconds. What is its effective cycle time?

• A. 157 seconds
• B. 161 seconds
• C. 173 seconds
• D. 182 seconds