Question
If the ratio of speed of boat in downstream and speed of
stream is 4:1, speed of current is 5 km per hr, What would be the distance travelled in upstream by the boat in 2 hours?Solution
Ratio of speed of boat in downstream and speed of stream is 4 : 1 Given Speed of current = 5 km/ h Speed of boat in downstream = 4 × 5 = 20 km/h Speed of boat in still water = Speed of boat in downstream – Speed of current = 20 – 5 = 15 km/h Speed of boat in upstream = 15 – 5 = 10 km/h Distance travelled by boat in upstream in 2 hours = 10 × 2 = 20 km
73920, 9240, ?, 220, 44, 11
21     84      168      172     ?     348
...171, 173, 183, 213 , ‘?’, 411, 633.
20, 36, 103, 406, ?, 12130
4 5.5 19 .5 98.5 694 6251.5
...124    174    211    ?     254    264
...440                 482              526                  572                ?  �...
366Â Â Â 276Â Â Â 196Â Â Â 126Â Â Â 66Â Â Â ?
520Â Â 79Â Â 440Â Â 151Â Â Â 376Â Â Â ?
69    119    156    ?     199    209
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