Speed of the boat in still water = 80 ÷ 5 = 16 km/h Speed of current = 16 × 0.4 = 6.4 km/h Therefore, upstream speed of the boat = 16 – 6.4 = 9.6 km/hr Required time taken = 96 ÷ 9.6 = 10 hours
How many different words can be formed with the letters of the word PRACTICE such that each of the word begin with E and ends with R?
How many different ways can the letters of the word ‘DEMONETIZATION’ be arranged?
There are 14 candidates for 5 post. In how many different ways can be post be filled?
A three-letter word is to be formed using the English alphabet where the first letter is a vowel, the second letter is a vowel different from the first,...
Geography books are always together.
In how many ways can the letters of the word PARALLEL be arranged so that all the L's do not come together?
How many 4-digit numbers can be formed from the digits 2,3,5,6,7 and 9 which are divisible by 3 and none are repeated?
In how many different ways can the letter of the word WELCOME is arranged so that vowels always occur together?
Find the quantity of methods of picking 4 cards from a set of 52 playing cards if four cards are of the same unit?
An examinee is required to answer the eight questions out of 16 questions which are divided into two groups each containing eight questions each and he...
