Question
The speed of a boat in still water is 7 km/hr and the
speed of the stream is 2.5 km/hr. A man rows to a place at a distance of 42.75 km and comes back to the starting point. The total time taken by him is:Solution
Rate downstream = (7 + 2.5) kmph = 9.5 kmph Rate upstream = (7 – 2.5) kmph = 4.5 kmph According to the question, Time = Distance/Speed Hence, Required time = 42.75/9.5 + 22.75/4.5 = 4.5 + 9.5 = 14 hours
Find the total number of Prime factor in the given expression?
315 × 56 × 68
Let N be the greatest number that will divide 72, 105, 138 leaving the same remainder in each case. Then sum of the digits in N is:
The LCM of two numbers is 540, and their HCF is 18. If one of the numbers is 90, find the other number.
Two numbers are in the ratio 2:7. The product of their H.C.F. and L.C.M. is 5054. The sum of the numbers is:
If the average age of "Ava," "Bella," and "Cara" is 30 years, and the ratio of their ages is 5:7:3, what is the age of "Cara"?
In a class, the ratio of number of boys to number of girls is 8:5. If 1 boy joined the class and 2 girls left the class, then the ratio becomes 7:4. Fin...
If 16 times a number is subtracted from the square of the number and then 64 is added to the result, then the result is zero. Find the L.C.M of the num...
Find the HCF and LCM of 24, 36 and 60.
Find the HCF of 240, 280 and 560.
The HCF of two numbers is 12 and their LCM is 720. If one of the numbers is 144, then what will be the other number?
