The speed of a boat in still water is 32km/hr and the speed of the current is 8km/hr. It takes a total of 15hours to row to upstream from Point A to B and downstream from Point B to C. If the distance between A to C is two-fifth the distance between B and C then what is the distance between B and C? (Where BC < AB)
Let the distance from B to C be xkm ∴ A to C = 2x/5 km Upstream speed = 32 – 8 = 24 km/hr Downstream speed = 32 + 8 = 40km/hr Now, 7x/(5 × 24) + x/40 = 15 7x/120 + x/40 = 15 (7x + 3x)/120 = 15 x = 180 km
2, 9, 19, 32, 48, 67, ?
10 625 50 125 250 25 ?
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...? + (55)2= (140)2– (80)2– 6278
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...If 18 x 10 42 -22,
Then, 50% of 2x - 25% of x = ?
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0 2 6 12 20 ?
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