Question
The speed of current is 9 km/h. What will be the
respective downstream speed and upstream speed of a boy rowing a boat, if one seventh of the distance covered going downstream in a certain time is equal to the distance covered going upstream in the same time?Solution
Let the speed of boy in still water be X km/h. And the speed of current = 9 km/h Downstream speed = (X + 9) km/h Upstream speed = (X – 9) km/h Let time be ‘t’ hours. ⇒ [(X + 9) t]/7 = (X – 9) t ⇒ X + 9 = 7X – 63 ⇒ X = 12 km/h Downstream speed = 12 + 9 = 21 km/h Upstream speed = 12 – 9 = 3 km/h
While calculating Pearson's correlation coefficient, the following values are obtained for 25 pairs of observations. It was later discovered that two pa...
When the price of a commodity decreases, and its demand curve forms a rectangular hyperbola, what happens to the total expenditure on that commodity?
For a frequency distribution if Coefficient of variation is 5, standard deviation is 2 and Karl Pearson’s coefficient of skewness is 0.5, the value of...
The government provides public goods because
In which of the following market structure Quantity is maximum?
The Fisher Effect assumes that the    Â
The costs of inflation are?
Which of the following Herfindahl-Hirschman Index is most consistent with monopoly?
The fiscal deficit is the difference between the government’s total expenditure and its total receipts excluding ______
Relevant for Exams:
