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Let the speed of stream be '2x' km/hr. So, speed of boat in still water = 1.5 X 2x = '3x' km/hr So, upstream speed of the boat = 3x - 2x = 'x' km/hr And downstream speed of the boat = 3x + 2x = '5x' km/hr ATQ, (135/5x) + (135/x) = 54 Or, (27/x) + (135/x) = 54 Or, (162/x) = 54 So, 'x' = (162/54) = 3 Speed of boat in still water = '3x' = 3 X 3 = 9 km/hr Therefore, required time = (180/9) = 20 hours
1000÷ 250 = ( 3√? × √1444) ÷ ( 3√512 × √361)
1540 ÷ 7 - 184 ÷ 8 = ?
12.232 + 29.98% of 539.99 = ? × 5.99
√256 * 3 – 15% of 300 + ? = 150% of 160
18 × 15 + 86 – 58 =? + 38
[5 X {(52 X 5) - 10} + 50 of 20] = ?
4(1/3) × 2(11/14) = 50% of ? + 86/11
(15 x 6 + 60% of 500 - 16 x 7) = ?
25% of 140 + 2 × 8 = ? + 9 × 5
If a nine-digit number 389x6378y is divisible by 72, then the value of √(6x + 7y) will be∶