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Let the distance be ‘D’ km According to the question, Downstream speed x + y = d/20 or d = 20 (x+y) .......... (i) Upstream speed x-y = d/30 or d = 30(x-y) ........... (ii) Comparing (i) & (ii) 20(x+y) = 30(x-y) 2(x+y) = 3(x-y) 2x + 2y = 3x - 3y x = 5y Hence, y = Speed of the current = 12 km/hour. Speed of boat, x = 5 × 12 = 60 km/hr
While calculating Pearson's correlation coefficient, the following values are obtained for 25 pairs of observations. It was later discovered that two pa...
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...
Which among the following is not an objective of SEBI?
Short-run returns to fixed supply of factor of production are known as
What is the term used when explanatory variable is correlated with the error term?
A worker’s wage in 1996 was Rs.180. What should be the wage in 1999 so that the worker remains at the same level of consumption? [Consider 1995 as the...
Holly, Brian, Fred, Tracy, and Melanie have income elasticities for veggie burgers as given below:
Person Income elasticity o...
The last period’s forecast was 70 and demand was 60. What is the simple exponential smoothing forecast with alpha of 0.4 for the next period...
