Question
The downstream speed of a boat is 6 km/hr more than its
upstream speed and the ratio of the speed of the boat in still water to the speed of the stream is 8:3. Find the total time taken by boat to travel 33 km downstream and 25 km upstream?Solution
Let the speed of boat in still water be x km/hr and that of stream be y km/hr. ATQ, ⇒ (x + y) – (x – y) = 6 ⇒ y = 3 km/hr ⇒ x = 3 × 8/3 = 8 km/hr Required time = [33/(8+3)] + [25/(8−3)] = 8 hr
More Number operation Questions
Simplify: 48 ÷ 4 × 2 + 5 × (7 − 3)
560 ÷ 14 × 3 – 25 = ?
- What will come in place of (?) in the given expression.
(0.2 × 0.5) + (0.3 × 0.4) = ? √? × 4 - 374 + 127 + 300 = 117
If (7a + b) : (7a - b) = 7:3, then find the value of a:b?
- Find the simplified form of the following expression:
128 - 85 of 2 + 26 X 4 641.5 + 72 × 8 = ? × 4
What will come in the place of question mark (?) in the given expression?
48 × 1...
55% of ? = 45 + 20 × 6
What will come in place of the question mark (?) in the following expression?
46 – 5² + 8² + 3² = ? × 4
