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Let the speed of the boat in still water and the speed of the current be ‘x’ km/hr and ‘y’ km/hr, respectively Upstream speed of the boat = (x – y) = 240/12 = 20 km/hr Or, 30 – y = 20 Or, y = 30 – 20 = 10 km/hr Therefore, downstream speed of the boat = 30 + 10 = 40 km/hr Required time taken = 140/40 = 3.5 hours
Anna is participating in a trivia game with 6 questions, each with 3 choices. Only one choice is correct per question. If Anna guesses on all questions,...
Out of three girls and five boys, five children are to be randomly selected for a dance programme. What is the probability that all the selected childre...
If the letter of the word Apples is arranged at random, what is the probability that all the vowels comes together?
A box contains 7 blue and 7 green balls. The probability of drawing three balls of the same colour is
What is the probability that a number selected from 1,2,3.......................68,69,70, is perfect square or a perfect cube?
What is the probability that three S’s come consecutively in the word ‘SUCCESSION’?
There are a total of 42 students (boys and girls) in a class. The probability of picking at least one boy when two students are picked from the class is...
The chance that Nikhil can solve a certain problem is1/7, the chance that Tarun can solve it is3/5. Find the probability that the problem is solved if t...
A bag contains 16 black and 18 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?
...A bag contains 20 white and some black balls. If the probability of drawing a black ball from the bag is 1.3 times that of drawing a white ball, ...
