Question
Speed of a boat in still water is three times the speed
of the boat in upstream. If the boat takes 44 minutes to cover 22 km in downstream, then find the speed of the boat in still water.Solution
Let speed of the boat in still water be ‘3x’ km/h. Speed of the boat in upstream = 3x ÷ 3 = ‘x’ km/h Speed of the stream = 3x – x = ‘2x’ km/h Speed of the boat in downstream = 3x + 2x = ‘5x’ km/h ATQ; (22/44) × 60 = 30 So, 5x = 30 Or, x = 6 So, speed of the boat in still water = 3 × 6 = 18 km/h
31% of 3300 +659 = ?
? = 200.24 + 1077.97 – 14.992
- 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.)
49.99% of 639.99 + 159.98% of 49.99 = ?2
What approximate value should come in the place of (?) in the following questions?
...
(8160.42 ÷ 33.73) + 309.79 + ? = 30.2 * 81.84(0.89 3 + 1.64 3 +2.76 3 ) ÷ 5.89 = ?
?% of 549.83 – 18.05 × 31.96 = 44.94% of 479.84 – 13.98 × 33.13
?% of (150.31 ÷ 14.97 × 50.011) = 319.98
{44.78% of (11.67 × 54.78)} ÷ 2.65 = ? + 19.25
811.85 ÷ 28.05 + 462.16 – 23.06 × 17.95 = ?
