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Speed of boat in still water is 7km/hour Let the Speed of Stream be x Km/hour 36/(7+x) + 36/(7-x) = 21 24 = 49- x2 x = 5 km/hour Now, the speed of Boat for the journey from A to B to take time 108 minutes is Speed of boat = y km/hour , Speed of stream =5km/hour , Time = 108 minutes (y+5) = (36×60)/108 = 20km/hour y+5 = 20 y = 15 km/hour ∴ Speed of Boat must be 15 km/hour.
What will come in place of the question mark (?) in the following series?
32, ?, 30, 46, 28, 44
80, ?, 240, 80, 20, 4
22, 37, 63, 98, 148, ?
114, 156, ?, 238, 274, 304
80 81.5 83.5 ? 89 92.5
...350 435 367 ? 384 401
...196, 167, 144, ?, 108, 95
124, 107, 91, ? , 62, 49
150 - 10× ( 7 - 2)/4× 8 = ?
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