A boat running downstream covers a distance of 56 km in 7 hrs and covering the same distance upstream in 14 hrs. What is the speed of a boat in still water?
Downstream speed = 56/7 = 8 km/hr Upstream speed = 56/14 = 4 km/hr So speed of boat in still water = (8 + 4)/2 = 6 km/hr
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Sandeep can solve 20 questions in 1 hour. If he decreased his efficiency by 20%, then how much time would he take to solve the same number of questions?
The largest three-digit number which gives the same remainder 3 when divided by 4, 9, 6 is:
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Five numbers are arranged in decreasing order. The average of the first four numbers is 60, and the average of the last four numbers is 55. What is the ...
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