Question
A boat goes 30 km downstream in 3 hour and the same
distance upstream in 5 hours. The speed of the boat in still water is:Solution
Downstream speed = 30/3 = 10 km/hr Upstream speed = 30/5 = 6 km/hr Speed of the boat in still water = (D + U)/2 = (10+6)/2 = 8 km/hr
- The sum of HCF and LCM of two numbers is 425. If the LCM is 16 times the HCF, and one number is 25, find the second.
If the product of two numbers is 108 and their HCF is 6, then find the LCM of the given two numbers.
The LCM of two numbers is 5 times of their HCF. The sum of LCM and HCF is 300. If one of the number is 250, then the other number is:
The LCM of two numbers is 168, and the numbers are in the ratio 4:7. Find the sum of the numbers.
Find the smallest number that leaves 13 as remainder when divided by both 32 and 48.
- Find the HCF of 84 and 630.
Find the LCM of the following fractions:
4/13, 5/7 and 7/5
The product of two numbers is 5760 and their GCD is 48. What is the LCM?
The greatest number of four digits which when divided by 9, 12, 15 leave remainders 6, 9, 12 respectively is:
What is the difference between the LCM and HCF of 38, 52?
