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Let speed of boat in still water and speed of stream be '7x' km/hr and '2x' km/hr, respectively. So, upstream speed of boat = 7x - 2x = '5x' km/hr ATQ, (240/5x) = 12 Or, 'x' = 4 So, downstream speed of the boat = 7x + 2x = 9x = 9 X 4 = 36 km/hr Therefore, required time = (144/36) = 4 hours
A task can be completed in 15 days when Akash and Bittu work together. Akash is 30% more efficient than Bittu. If both started the task separately and A...
'C' can complete a work in 18 days whereas 'D' can do the same work in 30 days.They started working together but 'C' worked with 60% of his efficiency w...
A certain number of men, represented as 'm', can finish a task in 40 days. However, if there were 15 additional men, the same task would be completed in...
Ishan alone can do a certain piece of work in 'w' days and Bhanumati can do it in '2w' days (w is a positive integer). Both together can do the work in ...
A and B alone can complete a work in 15 and 30 days, respectively. 50% of the work is completed by C in 2x days, and the remaining work is completed by ...
A can fabricate a divider in 10 days , while B alone can assemble it in 12 days, If they construct it together and get an installment of Rs 2200, then f...
If 14 men working 9 hours a day can make 24 quilts in 16 days, then in how many days 20 men working 12 hours per day will make 20 quilts?
Pawan can finish a task in 28 days, while Bhavna requires 7 more days than Pawan to complete the same task. They both started wor...
(x + 7) workers finish 60% of a job in 9 days working 4 hours/day. The remaining work is done by (x + 3) workers in 12 days working 3 hours/day. Find x.
‘M’ is 60% more efficient than ‘N’. ‘N’ started the work alone and worked for 20 days and after that ‘N’ is replaced by ‘M’. If the ...
