1. 4 men and 6 boys can finish a piece of work in 20 days,while 3 men and 4 boys can finish it in 28 days.find the time taken by one man alone and that by one boy alone to finish that work.
2. A person can row 6km upstream and 20km downstream in 3 hours. He can row 12km upstream and 30km downstream in 5 hours. Find the speed of the boat in still water and also the speed of the current.
3. Solve 8x +5y = 9
3x + 2y = 4
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