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Let the speed of stream and speed of boat in still water be 3x and 7x. When it travels downstream Then 3x+7x = 280/4 10x = 70 X = 7 time taken to cover same distance by upstream = 280/(7x-3x) = 280/28 = 10 hours
Find the average of first 12 whole numbers.
Find the number of zeroes in the product of 20 ×21× 22× ...
Find the unit digit of (57 129 - 7).
Which of the following number is rational number?
The sum of four consecutive even numbers is 108. What is the sum of the squares of these numbers?
Determine the highest power of 2 present in the given expression: In a group of three numbers first is double of second and half of third. The average of three numbers is 42. Find the difference between the first numb...