Question
The speed of current is 5 km/h. What will be the
respective downstream speed and upstream speed of a boy rowing a boat, if half 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 = 5 km/h Downstream speed = (X + 5) km/h Upstream speed = (X – 5) km/h Let time be ‘t’ hours. ⇒ [(X + 5) t]/2 = (X – 5) t ⇒ X + 5 = 2X – 10 ⇒ X = 15 km/h Downstream speed = 15 + 5 = 20 km/h Upstream speed = 15 – 5 = 10 km/h
A consumer purchases x1 = 40, x2 = 20 at the prices p1 = 4 and p2 = 12. He is also observed to purchase x1 = 36 and x2 = 8 at the prices p1 = 6 and p2 =...
Consider the following:
Statement 1: There exists an inverse relationship between market rates of interest and price of bond
Statement 2: ...
When exchange rate in terms of domestic currency rises:-
Refer to the below table and calculate the NNPmp
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Determine the relationship between the mean and me...
The two regression lines are 6X+4Y=52 and 12X+6Y=62. Find the correlation coefficient.
...With reference to Pradhan Mantri Kaushal Vikas Yojana, consider the following statements:
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An increase in the international reserves of an economy indicates that
The coefficient of correlation between two variables X and Y is 0.6 .
The covariance between X and Y is 30 .
The variance of X is 25 .
...
