A transport company charges for its vehicles in the following manner
If the driving is five hours or less, the company charges Rs. $60$ per hour or Rs. $12$ per km (whichever is larger)
If driving is more than $5$ hours, the company charges Rs. $50$ per hour or Rs. $75$ per km (whichever is larger)
If Anand drove it for $30$ km and paid a total of Rs. $300,$ then for how many hours does he drive?
- $4$
- $5.5$
- $7$
- $6$