Question
The speed of a boat while going downstream is 24 km/h, and
while going upstream, it is 16 km/h. If the boatman takes 12 hours to cover (m + n) km upstream when the stream flows at twice its normal speed, find the average of m and n.Solution
ATQ,
Let speed of boat in still water and stream speed be B km/hour and s km/hour, respectively.
So, B + s = 24 … (i)
B - s = 16 … (ii)
Solving equation (i) and (ii), we get,
B = 20 km/hour
s = 4 km/hour
According to the question,
(m + n)/(B - 2s) = 12
(m + n) = 12 × (20 - 2 × 4) = 12 × 12 = 144 km
Therefore, average value of m and n = (m + n)/2 = 144/2 = 72 km
What will be come in place of (?) in the given number series.
2, 6, 18, 54, ?, 48612 of 8 - 9 ÷ 3 × 16 - 17 + 6 of 4 - 15
Shivam invested 20000 at 12% p.a. simple interest for ‘x’ months. If at the end of ‘x’ months, he received a total amount of Rs.23600. What is t...
A triangle has sides 7 cm, 24 cm, and 25 cm. A circle is inscribed in the triangle. What is the area of the triangle not covered by the circle?
What does the "Word Count" feature in a word processing software typically provide?
A rectangle has a perimeter of 60 cm, and the ratio of its length to its width is 3:2. Find the length of its diagonal.
In an interview, a total of 160 employees participated, including 100 men and the remaining women. Among these employees, 80% ach...
? = 234.87 + 32.14% of (59.88 x 70.04)
The equation of the circle passing through points A(1,0), B(0,6), and C(4,2) is
