A Submarine undertakes a journey, covering a distance of 44.8 km against the current in precisely 2 hours and 48 minutes. The challenging task at hand is to determine the Submarine's speed when there's no current (in still water), given that the ratio of its upstream speed to downstream speed is 4:7.
ATQ, Speed of Submarine in upstream = 44.8/2.8 = 16 km/h Speed of Submarine in downstream = 16/4 × 7 = 28 km/h Speed of Submarine in still water = (16 + 28)/2 = 22 km/h
Roger Federer play 3 sets of a tennis match. The probability of his winning the three sets are 1/9,1/4,3/4 respectively. What is the probability that he...
Three cards are drawn one after another with replacements from a pack of cards. What is the probability of getting the first card a Jack, the second car...
A bag contains 13 white and some black balls. If the probability of drawing a black ball from the bag is twice that of drawing a white ball, find the nu...
What will be the probability of choosing one red and one green ball from a basket containing 4 red and 5 green balls if two balls are drawn randomly?
A bag contains 5 red flowers, 7 yellow flowers and 8 green flowers. 3 flowers are drawn randomly. What is the probability that the flowers drawn contain...
From a pack of 52 cards, One card is drawn at random. What is the probability that the card drawn is a king or a heart?
In a factory which manufactures calculators, machines A, B and C manufacture respectively 25%, 35% and 40% of the calculators. Of their outputs, 5, 4 an...
There are 8 boys and 4 girls giving interview for a job. If three of them are selected, then what is the probability that one of the three is a girl an...
34 pens are there in a box where 10 are red pens, ‘p’ are blue pens and remaining are black pens. If a pen is picked, the probability of getting blu...
Two schools, A and B participate in a Quiz competition. The probability of A’s winning is 3/7 and the probability of B’s winning is 3/5. Wha...