Let the speed of stream be ‘x’ km/hr. So, speed of boat in still water = 6 × x = 6x km/hr Downstream speed of boat = 6x + x = 7x km/hr According to question; 7x = 112/8 = 14 Or, x = 2 Upstream speed of the boat = 6x – x = 5x = 5 × 2 = 10 km/hr Required time taken = 90/10 = 9 hours
A bowl contains 9 blue balls, 7 white, and 5 black balls. If 2 balls are drawn in one go, then the probability of exactly one ball being blue is:
If the letter of the word Apples is arranged at random, what is the probability that all the vowels comes together?
There are 14 boys and 6 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...
In a lottery there are 5 prizes and 50 blanks. A lottery is drawn at random. What is the probability of getting the prize?
...If a coin is tossed 10 times then what is the probability of getting three heads?
A container holds (x + 10) marble stones, (x + 12) quartz stones, and (x + 20) granite stones. The probability of drawing a granite stone is (5/12). Fin...
The probability that Leah will be accepted into program P is 60% and into program Q is 40%. Leah prefers program 'P' first, then 'Q', and finally 'R'. A...
A box contains 7 blue and 7 green balls. The probability of drawing three balls of the same colour is
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...
Tokens numbered 1 to 350 are in a bag. What is the probability that the Token drawn has a number which is a multiple of 6 or 7?
