Let the speed of the boat = 9km/hr Speed of current = x km/hr Speed upstream = (9 – x) km/hr Speed downstream = (9 + x) km/hr Time upstream + time downstream = 3 hours Time = distance/(speed ) 12/(9-x)+ 12/(9+x) = 3 x = 3 km/hr
81, 90, 108, 135, 171, ?
16, 54, 128, ‘?’, 432,686
14 15 32 99 400 ?
...12 7 10 25 107 ?
...200 ? 96 38.4 7.68 0
...542 541 532 507 458 ?
...25 34 61 106 169 ?
...The question below is based on the given series I. The series I satisfy a certain pattern, follow the same pattern in series II and answer the questions...
5, 8, 17, ?, 37, 48
31 35 60 124 ? 441
...
