Question
A man can swim at a speed of 5.5 km/hr in still water.
He swims upstream from a certain point in the river and then back to the same point. If the speed of the current of the river is 2.5 km/hr. Find the average speed of his total journeySolution
Given; speed of man in still water = 5.5 km/h  Speed of stream = 2.5 km/h Speed in upstream = 5.5 – 2.5 = 3 km/h Speed in downstream = 5.5 + 2.5 = 8 km/h Average speed= =(2s1 s2)/(s1+s2 ) =(2×3×8)/(3+8)=48/11 =4.36km/h
More Boats and streams Questions
1885 ÷ 64.98 + 7.29 + ? = 69.09
212 + 14 × 23 – 28 × 15 = ? Â
(22² × 8²) ÷ (92.4 ÷ 4.2) =? × 32
567-4824 ÷ 134 =? × 9
Determine the value of 'p' in the expression.
28 ÷ 22p + 1 = 43Â
What will come in place of (?) in the given expression.
(15) ² - (13) ² = ?? = 6.25% of 240 + 25 2 + 17 2 – 16 × 17
35% of 840 + 162 = ? – 25% × 300
(7/5) × (3/4) × (5/9) × (6/7) × 3112 = ?
1024 ÷ 16 + 800 ÷ √64 + ? = 200 * 2
