Dkumar Posted June 13, 2005 Share Posted June 13, 2005 1.If it takes 10 days to dig a trench 100 m long, 50 m broad and 10 m deep, what length of trench, 25m broad and 15 m deep can be dug in 30 days? a 400m b 200m c 100m d 88(8/9)m 2.If 9 men working 15/2 hrs a day can finish a piece of work in 20 days, then how many days will be taken by 12 men, working 6 hrs a day to finish the work, it being given that 2 men of latter type work as much as 3 men of the former type? 1 19/2 b 11 c 25/2 d 13 Quote Link to comment Share on other sites More sharing options...
arjmen Posted June 13, 2005 Share Posted June 13, 2005 1) Volume of trench dug per day = 100*500/10 => Volume of trench dug in 30 days = 3*100*500 Length of trench = 3*100*500/(25*15) = 400 m 2) Work = 9*r*(15/2)*20 = 12*r'*6*d, where r and r' are the respective rates of work r' = (3/2)r => 9*15*10 = 6*3*6*d => d = 9*15*10/(6*3*6) = 25/2 days Quote Link to comment Share on other sites More sharing options...
Dkumar Posted June 13, 2005 Author Share Posted June 13, 2005 you got them.:tup: Quote Link to comment Share on other sites More sharing options...
sonur Posted June 22, 2005 Share Posted June 22, 2005 could you please explain the second problem how did you get r'=(3/2)r ????kindly explain ???the solution in detail...i appreciate your help thx Quote Link to comment Share on other sites More sharing options...
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