Question
If the sum of upstream and downstream speed is 32 km/hr
and the speed of the current is 6 km/hr. Then find time taken to cover 44 km in downward?Solution
Let the speed of boat in still water be x km/hr. According to the question, => x + 6 + x − 6 = 32 => x = 16 Downstream speed = 6 + 16 = 22 km/hr Required time = 44/26 = 2 hrs
4 10 ? 62.5 156.25 390.625
...84, 63, ?, 283.5, 1701
45, ?, 84, 114, 151, 195
Find the missing number in the given number series.
 1165, ?, 1040, 985, 935, 890Â
25   25   37.5   ?   328.125   1804.6875
16, 32, 68, 132, ?, 376
What will come in place of (?) question mark in the given number series.
13, 15, 18, 23, 30, ?
What will come in place of the question mark (?) in the following series?
21, 36, 66, 126, ?, 486
?, 32, 75, 144, 245, 384
Find the missing number in the given number series.
442, 424, 410, 400, 394, ?