Question
A boat goes 8 km an hour in still water, but takes twice
as much time in going the same distance against the current. The speed of the current (in km/hour) is :Solution
Let the speed of the current be x kmph. According to the question, 8/(8 – x) = 2 ⇒ 16 – 2x = 8 ⇒ 2x = 16 – 8 ⇒ x = 8/2 = 4 km/hr
Three numbers a, b and c are co-prime to each other such that ab = 78 and bc = 65. Find the value of (a + b + c).
The greatest number of four digits which when divided by 10, 12, 14 leave remainders 8, 10, 12 respectively is:
Ratio of two numbers 8:15 and their LCM is 2400. Find the sum of the given two numbers.
Find the difference between sum of digits of LCM and HCF of 36, 84 and 132.
Four runners started running simultaneously from a point on a circular track. They took 400 seconds, 600 seconds, 720 seconds and 900 seconds to comple...
If there is a loss of 20% on selling the article at 16/27 of the original selling price then what will be the percentage profit after selling the articl...
- The L.C.M and H.C.F of two numbers have a sum and difference of 440 and 120. If one number is 40, find the other.
Let N be the greatest number that will divide 92, 114, 136 leaving the same remainder in each case. Then sum of the digits in N is:
- Find the least common multiple of (18/27), (24/36), and (30/45).
The HCF and LCM of two natural numbers are 15 and 75, respectively. What is the difference between the two numbers, if one of the numbers is 25?
