Question
The speed of a boat in still water is 32km/hr and the
speed of the current is 8km/hr. It takes a total of 15hours to row to upstream from Point A to B and downstream from Point B to C. If the distance between A to C is two-fifth the distance between B and C then what is the distance between B and C? (Where BC < AB)Solution
Let the distance from B to C be xkm ∴ A to C = 2x/5 km Upstream speed = 32 – 8 = 24 km/hr Downstream speed = 32 + 8 = 40km/hr Now, 2x/(5 × 24) + x/40 = 15 2x/120 + x/40 = 15 (2x + 3x)/120 = 15 x = 360 km
7, 78, 324, 900,1855, 3128
191 341 221 331 251 281
Find the wrong number in the given number series.
134, 163, 194, 231, 274, 315
53, 57, 66, 82, 117, 143, 192
 44, 57, 81, 119, 170, 234, 311.
192Â Â Â 576Â Â Â 72Â Â Â 216Â Â Â 28Â Â Â 81
0 7 26 63 126 215
...71 81 61 101 51 181
Find the wrong number in given number series.
2669, 2838, 2993, 3185, 3397, 3629
119, 145, 186, 249, 340, 483