57 1.45 3 men and 4 boys can earn R...
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57 1.45 3 men and 4 boys can earn Rs 749 in 7days.11men and 13 boys can earn Rs. 3024 in 8 days in what time will 10 men with 8 boys earn Rs. 4040.4? (A) 12 days (B) 12.5 days (C) 13 - days 1 (D) 13 days n river at 55 5 km/hr. and round up Q.5

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( begin{array}{c}7(3 x+4 y)=749 3 x+4 y=107 8(11 x+13 y)=3024 11 x+13 y=378 3 x+4 y=107 & x 3 33 x+39 y=378 x 3 33 x+44 y= & 107 x 11 5 y= & 43 y=8.6 x= & 24.2 k=10 x+8 y & =4040.4 k x 310.8= & 4040 cdot 4 k=13 text { days } & (0) text { ans }end{array} )
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