Question
A boat can cover 195 km in downstream in 10 hours and
140 km in upstream in 14 hours. Find the distance travelled by the boat in still water in 4 hours.Solution
Downstream speed of the boat = 195/10 = 19.5 km/hr Upstream speed of the boat = 140/14 = 10 km/hr Speed of boat in still water = (19.5 + 10)/2 = 14.75 km/hr Distance travelled by the boat in still water in 4 hours = 14.75 × 4 = 59 km
20Â Â Â 60Â Â Â Â 150Â Â Â Â 300Â Â Â 450Â Â Â ?
24 47 137 ? 2679 16049
...6Â Â Â Â Â Â Â Â Â Â Â Â Â 7Â Â Â Â Â Â Â Â Â Â Â Â Â 15Â Â Â Â Â Â Â Â Â Â 46Â Â Â Â Â Â Â Â Â Â 185Â Â Â Â Â Â Â Â ?
...203, 223, 198, 218, ?, 213
5     16     ?      66     119      200
...30 29 91 446 ? 28217
11Â Â Â 46Â Â Â 109Â Â Â 208Â Â Â Â 351Â Â Â Â ?
28 34 63 ? 769 3847
...In the question, three series I, II and III are given. Find the value of x, y and z to establish the correct relation among them and choose the correct...
30, 39, 66, ? , 174, 255
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