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Start learning 50% faster. Sign in nowUpstream speed = 273/7 = 39 km/h Downstream speed = 441/9 = 49 km/h Speed of boat in still water = (39 + 49)/2 = 44 km/h Speed of stream = (49 – 39)/2 = 5 km/h Increased speed of boat in still water = 44 + 4 = 48 km/h Decreased speed of stream = 5 – 2 = 3 km/h Required time taken = 540/(48 – 3) + 459/(48 + 3) = 12 + 9 = 21 hours
There are five containers in a truck hold. The weight of the first container is 100 kg and the weight of the second container is 20% higher than the wei...
The average age of each of the 20 employees in an IT company is 20 years. When you include the age of the Team leader, the company's average age becomes...
The average cost price of 15 pens (having equal cost price) decreased by Rs.2, when one of the pen is replaced by a new pen having cost price of Rs.70. ...
Average run scored by a batsman in 20 innings is 88. In next 6 innings, he scored runs with an average of ‘x’ so that his overall average increases ...
The average of the present ages of Arun, Mohan, and Deepak together is 30 years. Five years from now, the sum of the ages of Mohan and Deepak will be 66...
The batting average for 27 innings of a cricket player is 47 runs. His highest score in an innings exceeds his lowest score by 157 runs. If these two i...
The mean of a set of 8 numbers is 80. If the average of the first four numbers and the last two numbers is 90 and 60, respectively, and the ratio of the...
Average age of 30 students is 14 years. If 6 students leave the class, then the average age decreases by 0.5 years. Find the average age of the students...
