Question
When a speed of stream is 25% of the speed of boat in
still water. If the boat can travel 60 km upstream in 5 hours and 80 km downstream in 4 hours, then what will be the distance travelled by boat in still water in 3 hours.Solution
ATQ, we can say that Speed of water is = x km/hr speed of boat in still water is = 4x km/hr Upstream speed = 12 km/hr 3x = 12 x = 4 Speed of boat in still water = 16 km/hr Required distance in 3 hours = 16 x 3 = 48 km
What will come in the place of question mark (?) in the given expression?
(12.09)2 × 5.98 ÷ 26.95 = ? + 25Â
√441 * 7 – 10% of 250 + ? = 140% of 120

30% of 8/5 × 5/7 × 2870 =?
1231 + 1312 + 2113 – 3211 = ?
{(3/8) + (5/6)} × 120 – 53 = ?Â
What will come in the place of question mark (?) in the given expression?
23 X 35 - ? = (132 + 16) X 3 + 25
56 × 18 + ? × 21 – 49 × 12 = 63 × 26Â
- Evaluate: 168 ÷ 12 × 5 + 190 – 20% of 450