A man can go on a motor boat with a speed of 15 km/hour in still water, he goes to a certain distance upstream and come back to the starting point in a river which flows at a speed of 5km/hour. Find the average speed of motor boat for total journey?
Let, the speed of boat be u km/hour and speed of current be v km/hour Average speed = 2xy/(x+y) (here, x is speed of downstream and y is speed of upstream) = (2 (u+v)(u-v))/((u+v+u-v)) = (u2-v2)/u = (225-25)/15 = 40/3 km/hour IXAMBEE Method :- Average speed = (Total distance covered)/(total time taken) = (2×60)/9 =40/3 km/hour
If 35 @ 18 = 66 and 49 @ 22 = 136, then 23 @ 44 = '?'.
Select the option that is related to fourth number in the same way as the first number is related to the second number and the fifth number is related t...
If 89 # 97 = 135 and 68 # 86 = 96, then 88 # 89 = ?
55 : 10 :: 63 : ?
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A @ B means ‘A is the daughter of B’
A & B means ‘A is the husband of B’
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If 5459 = 450, 2485 = 160 and 8763 = 504, then 3474 = __.
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If ACE = 135 and ACER = 13518, then ACCURATE =