Question
A motor boat covers a certain distance downstream in a
river in 2 hours. It covers the same distance upstream in 2 hours and 30 minutes. If the speed of water is 3.5 km/h, then the speed of the boat in still water is:Solution
Let the speed of boat in still water be x km/hr and the distance be y km. Rate downstream = (x + 3.5) km/hr Rate upstream = (x – 3.5) km/hr According to the question, y/(x + 3.5) = 2 --- (i) y/(x – 3.5) = 5/2 --- (ii) On dividing equation (i) by (ii), (x – 3.5)/(x + 3.5) = 2/(5/2) = 4/5 5x – 16.5 = 4x + 15 x = 16.5 + 15 = 31.5 kmph
What will come in the place of question mark (?) in the given expression?
What will come in the place of question mark (?) in the given expression?
{250% of 46 + 16 ÷ (1/5)} ÷ 15 = ? ÷ 3 – 29
12% of 10% of 15% of 5000 + (12 x 15) = ?
8 × (25 % of 720) – 50 % of 135 % of 840 = ?
- What will come in place of (?), in the given expression.
√2500 + 12² – 144 ÷ 6 = ? 81% of 2300 – 34% of 550 = ?
9/5 × 18/25 ÷ 42/21 = ? - 82/75
36% of 250 + 26 ÷ 2 × ? = 207
(630 ÷ 18 + 24 of 25) ÷ 5 = ?
In the question, two Quantities I and II are given. You have to solve both the Quantity to establish the correct relation between Quantity-I and Quantit...
