Question
Speed of a boat in still water is 9 km/hr. It goes 12 km
downstream and comes back to the starting point in three hours. What is the speed of water in the stream?Solution
Let the speed of the boat = 9km/hr Speed of current = x km/hr Speed upstream = (9 – x) km/hr Speed downstream = (9 + x) km/hr Time upstream + time downstream = 3 hours Time = distance/(speed ) 12/(9-x)+ 12/(9+x) = 3 x = 3 km/hr
If '$ means +', '# means –, '@ means ×' and '* means ÷', then what is the value of ' 16 $ 4 @ 5 # 72 * 8 ' ?
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Interchanges: Sig...
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Select the correct combination of mathematical signs that can sequentially replace the ‘*’ signs and balance the given equation.
11 * 4 * 55 ...
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480 - 12 + 250 X 3...
In a certain code of language, ‘+’ represents ‘x’, ‘-‘ represents ‘+’, ‘x’ represents ‘÷’ and ‘÷’ represents ‘-‘ what ...
Select the number from among the given options that can replace the question mark (?) in the following series.
24, 35, 51, 73, 102, ?
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