Question
Speed of a boat in still water to speed of boat in
upstream is 16: 13. If the boat can travel 228 km in downstream in 6 hours, then find the time taken by the boat to cover 24 km in still water.Solution
Let speed of boat in still water and speed of boat in upstream be ‘16x’ km/h and ‘13x’ km/h, respectively. Speed of stream = 16x – 13x = 3x km/h Speed of boat in downstream = 16x + 3x = 19 km/h So, 19x = 228/6 => x = 2 Speed of boat in still water = 16 × 2 = 32 km/h Desired time = 24/32 x 60 = 45 minutes
36% of 640 – 12.5% of 352 + 25% of 640 = ? – 48% of 432
- Find the value of:
35% of [150% of (45 + 15) + 150] ÷ 75 × 80 What will come in the place of question mark (?) in the given expression?
(30 × 5 + 20) × 2 = ?
115 ÷ 23 + 12 × 6 = ? + 16 - 35
17% of 250 + ? = 108
15% of 1800 + 22 = ?Â
46.2 × 8.4 × 3 + ? = 1200
What will come in place of the question mark (?) in the following expression?
40% of 150 – ?% of 80 = 25% of 400
The value of 42 ÷ 9 of 6 - [64 ÷  48 x 3 – 15 ÷ 8 x (11 – 17) ÷ 9] ÷ 14 is:
128 ÷ 22 × ? = 15% of 300 ÷ 9
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