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Let, the speed of boat be b km/hour and speed of current be s km/hour Average speed = 2xy/(x+y) (here, x is speed of downstream and y is speed of upstream) = (2 (b+s)(b-s))/((b+s+b-s)) = (b2 - s2)/b = (225 - 25)/15 = 200/15 = (40/3) km/hour Alternate Method :- Average speed = (Total distance covered)/(total time taken) = (2×60)/9 = 120 /9 = 40/3 kmph
Given the following data for a country:
Fiscal deficit: $50 billion
Interest payments: $15 billion
Capital expenditure: $25 bi...
The maximum rate of income tax which...
Probability that A will be alive in 20 years is 0.7 and probability that B will be alive in 20 years is 0.6, then what is the probability that they bo...
A person who is made redundant because of the contraction of an industry is a victim of?
In a perfectly competitive market, a firm’s long run supply curve is
If f(x) is continuous for all real values of x and f(x) takes on only rational values, then if f(1)=1, the value of f(0) is
Consider the matching-pennies game:
Let p= probabi...
Amber, Blue and Green boxes is related to which sector as per WTO terminology ?
Given two lines of regression x+3y=11 and 2x+y=7. Find the coefficient of correlation between x and y.
In a study examining the relationship between hours of study (X) and test scores (Y) of students, a bivariate regression analysis was conducted. The fol...