Question
The speed of a boat in still water is 5 times the speed
of the stream. If the difference between the upstream and downstream speed of the boats is 24 km/hr, then find the time taken by the boat to travel 384 km in upstream.Solution
Let the speed of the stream be ‘x’ km/hr Therefore, speed of the boat in still water = 5x km/hr Upstream speed of the boat = 5x – x = 4x km/hr Downstream speed of the boat = x + 5x = 6x km/hr According to the question, 6x – 4x = 24 => 2x = 24 => x = 12 Therefore, upstream speed of the boat = 4x = 48 km/hr Required time taken = 384/48 = 8 hours
What will come in the place of questions (?) mark in the following questions.
53, 55, 61, 71, 85, ?
√(10198 )× √(7220 )÷ 16.69 + 2010.375= ?
7, 7, 14, 40, ?, 227
24, 42, 60, ?, 96, 114
196, 196, 203, 229, 292, ?
500, 250, 750, 375, 1125, 562.5, ?
22, 37, 63, 98, 148, ?
What will come in the place of questions (?) mark in the following questions.
1204, 1218, ? , 1267, 1302, 1344
- What will come in place of the question mark (?) in the following series?
13, 15, 18, 23, 30, ? What will come in place of the question mark (?) in the following series?
325, 292, 262, 229, ?, 166
