Question
A boat takes one-third time in moving a certain distance
downstream than upstream. The ratio of the speed of the boat in still water and that of the current isSolution
Let the speed of boat in still water = x km/hr, and Speed of current = y km/hr Rate downstream = (x + y) km/hr, and Rate upstream = (x – y) km/hr Distance = Speed × Time Øž (x - y) × 3t = (x + y) × t => 3x - 3y = x + y => 3x - x = 3y + y => 2x = 4y => x/y = 4/2 = 2 : 1
- 160, 340, 240, 480, 360, 720
256Â Â Â 768Â Â Â 96Â Â Â 288Â Â Â 35Â Â Â 108
384, 1152, 144, 432, 56, 162
5000, 4050, 3240, 2268, 1360.8, 680.4
- Find the wrong number in the given number series.
12, 21, 5, 38, 2, 71 191 341 221 331 251 281
- Find the wrong number in the given number series.
25, 34, 18, 34, 9, 46 12, 91, 172, 249, 328, 407
8 10.4 6.8 10.2 7.6 10
Find the wrong number in the given number series.
84, 120, 183, 246, 336, 444