Question
Speed of a boat in still water is 9 kmph and speed of
stream is 6 kmph. A man rows to a place at a distance of 30 km and come back to starting point. The total time taken by him is:Solution
Rate upstream = 9 – 6 = 3 kmph Rate downstream = 9 + 6 = 15 kmph Time taken to go upstream = 30/3 = 10 hr Time taken to go downstream = 30/15 = 2 hr Total time = 10 + 2 = 12 hrs
More Boats and streams Questions
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
24.45% of 14.99% of 14999.78 + 159.80 = ?% of 1999.78
15.78% of (287 + 302) + 12³ = ?% of 170 + 8 × 14 + 3²
? = 65.78² ÷ (5.01⁵ + 7.02 × 33.33) + 33.33% of (290.88 × 23.09)
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
1784.04 - 483.98 + 464.98 ÷ 15.06 = ?3
? = 54.89 × 270.08 ÷ 135.17 + 464.35 ÷ 29.03
233.98 + 73 × √35.95 - ? = 275.94 ÷ 3.99
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