Question
A man rows a certain distance downstream in 5 hours and
back to the same point in 8 hours. If the speed of the stream is 4.5 km/hr then what is the speed of the man in still water?Solution
Let the speed of the man in still water be x km/hr. Downstream speed = (x+ 4.5) km/hr. Upstream speed = (x- 4.5) km/hr. (x+ 4.5) × 5 = (x- 4.5) × 8 5 x + 22.5 = 8 x - 36 3 x = 58.5 ∴ x = 19.5 km/hr.
More Boats and streams Questions
- What will come in place of the question mark (?) in the following questions?
180÷3×2+6=? (15 × 225) ÷ (45 × 5) + 480 = ? + 25% of 1240
- What will be come in place of (?) in the given expressions.
√324 + (18 × 5) – 72 ÷ 8 = ? 322 – 182 + 11 × 24 = ?
?% of 18% of 2600 = 234
315 ÷ 9 + 23 × 3+ 22 = ?× √441
119 ÷ [22 - {90 ÷ (23 - 105 ÷ (7 × 3))}] = ?
8 × 12 + 110 ÷ 5 = 72 + ?
What value should come in the place of (?) in the following questions?
(3√1728 * 25) ÷ 3 * ? = 250 + 50* 3
(2/3) × (5/7) × (3/4) × ? = 80
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