Let the distance be x, then, Upstream speed = 21(3/2)km/h - 12.5 km/h ⇒ 22.5 - 12.5 ⇒ 10 km/h Downstream speed = 22.5 km/h + 12.5 km/h = 35 km/h According to the question, (x/10) + (x/35) = 40/60 ⇒x(1/10 + 1/35) = 2/3 ⇒x(45/350) = 2/3 ⇒x = (2 × 70)/(3 × 9) x = 5(5/27) km
Average of four numbers is 18. Sum of smallest and largest number is 32. If difference between other two numbers is 2, then find the square of second sm...
The average weight of 4 persons is 36 kg. The heaviest person’s weight is 26 kg more than the lightest person’s weight. If the average weight of the...
A number is such that when it is multiplied by 5, it gives another number which is as much above from 210 as the original number (itself) is below 210. ...
In a school with 400 students, the average age of the boys is 16 years and that of the girls is 12 years. If the average age of school is 14 years 9 m...
The average age of 14 girls is 42 years. If the age of two more girl is added the average decreases by one and a half year. What is the sum of the age o...
What will be the average of odd numbers between 20 to 74?
Average run scored by a batsman in 18 innings is 60. In next 6 innings, he scored runs with an average of ‘x’ so that his overall average increases ...
18 years ago the average age of a family of four members was 45 years. Two children were born in that span of 18 years. The present average age of the ...
A and B started a business investing Rs. 1200 for ‘x’ months and Rs. 1800 for 16 months, respectively. Out of total profit of Rs. 3500, pro...
Average marks scored by Vineet in five subjects are 75. The average marks scored by him (excluding his highest and lowest marks) are 60 and lowest marks...