A boat takes 5 hours longer to travel 15 km upstream than it does to travel 20 km downstream. The speed of the boat in still water is 5 km/hr. Calculate the speed of the current.
Let the speed of the current be x km/hr According to the question, 15/(5 – x) – 20/(5 + x) = 5 Or, x2 + 7x – 30 = 0 Or, x2 + 10x – 3x – 30 = 0 Or, x(x + 10) – 3(x + 10) = 0 Or, (x – 3) = 0 or, (x + 10) = 0 X = -10 km/hr not possible Therefore, x = 3 km/hr Hence, option b.
statement:
All parrots are owls.
Some parrots are birds.
All birds are lions.
conclusion:
I. Some lions are owl...
'P + Q' means 'P is the daughter of Q'
'P × Q' means 'P is the son of Q'
'P – Q' means 'P is the wife of Q'
Which of the followi...
In a certain code language, 'CONSUME' is written as 'CEMNOSU' and 'COMPEL' is written as 'CELMOP'. How will "ENGLISH" be written in that language?
Sunita is ranked 10th from the top and 18th from the bottom in her class. How many students are there in the class?
Which two numbers should be interchanged to make the given equation correct?
700 + 42 ÷ 6 × 45 – 54 × 9 + 14 = 355
Statement I: All bats are balls.
Statement II: All balls are badmintons.
Statement III: All badmintons are wickets.
Conclusion I:...
In the following question, select the missing number from the given series.
64, 72, 45, 109, –16, ?
By Interchanging the given two numbers (not digits) which of the following equation will be not correct?
7 and 3
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In a certain code language, '893' means 'Shahid likes cakes', '137' means 'cakes are delicious', and '274' means 'we are girls'.
Which of the fol...
