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Let the speed of the stream be 'M' km/h Speed of the ferry in still water = (7M + M) = 8M km/h Downstream speed = (8M + M) = 9M km/h Upstream speed = (8M – M) = 7M km/h Acc. to the question, 32.4 = 9M × (108/60) M = 2 km/h Upstream speed = 7M = 7 × 2 = 14 km/h Distance travelled = 6.4 × 14 = 89.6 km
8 9 30 155 ? 9837 108218
...11, 12, 16, 25, ?, 66
94 282 284 852 856 2562
...13 14 22.5 ? 120 363
...Complete the series choosing the missing number.
8, 13, 20, ____, 40.
(32.03 + 111.98) ÷ 18.211 = 89.9 – 20.23% of ?
0 2 10 24 68 120
...28 57 172 689 ? 20677
...12 7 10 25 107 ?
...11 12.1 14.3 17.6 22 ?