Ramesh can complete a work in 12 days, working 7 hours a day. Suresh can complete the same work in 8 days, working 9 hours a day. If Ramesh and Suresh work together working 7 hours a day, in how many days can they complete the work?
Choose the correct choice from the following:	A) 5 * 7 / 13	B) 5 * 7 / 19	C) 5 * 7 / 11	D) 5 * 7 / 19	E) 5 * 6 / 11
Explanation:   Ramesh can finish the work in 12 * 7= 
<gadget id="calculator">12 * 7</gadget>
<output>84</output>
84 hours   Amount of work he can complete in 1 hour= 1/84   Suresh can finish the same work in   8 * 9= 
<gadget id="calculator">  8 * 9</gadget>
<output>72</output>
72 hours   Amount of work he can complete in 1 hour= 1/72 hours   Work done by both of them in 1 hour =   = 1/84 + 1/72 = 13/504   Ramesh and Suresh together can complete the work in 504/13 hours.   i.e. 504/13 * 1/7 = 72/13 days   i.e. 5 * 7 / 13 days   5 * 7 / 13NSWER: 5 * 7 / 13
<result>A</result>
Ramesh can complete a work in 12 days, working 7 hours a day. Suresh can complete the same work in 8 days, working 9 hours a day. If Ramesh and Suresh work together working 7 hours a day, in how many days can they complete the work?