If a tank A can be filled within 10 hrs and 1/4th of tank B is filled in 19 hrs. Then what is the duration of the tank B to fill completely?
Choose the correct option:
A) 74 B) 75 C) 76 D) 77 E) 78
1/4th of tank B takes 19hrs then   to fill completely it takes 19*4= 
<gadget id="calculator">19*4</gadget>
<output>76</output>
76hrs   ANSWER:76
<result>C</result>
If a tank A can be filled within 10 hrs and 1/4th of tank B is filled in 19 hrs. Then what is the duration of the tank B to fill completely?