Pipe C is a filling pipe and can fill an empty tank in 100 hours whereas pipe D and E are emptying pipes and can empty a tank in 200 hours and x hours, respectively. If All the three pipes were opened together. They took 10 hours to fill \(\frac{1}{{60}}^{\rm{th}}\) part of the tank. What is the value of x?
1
400
2
250
3
300
4
500