Question
The speed of a boat in still water is 30 km/hr. If the
boat covers 240 km in upstream in 12 hours, then find the time taken by the boat to travel 120 km in downstream.Solution
Let the speed of the boat in still water and the speed of the current be βxβ km/hr and βyβ km/hr, respectively Upstream speed of the boat = (x β y) = 240/12 = 20 km/hr Or, 30 β y = 20 Or, y = 30 β 20 = 10 km/hr Therefore, downstream speed of the boat = 30 + 10 = 40 km/hr Required time taken = 120/40 = 3 hours
Plucking stage is attained when tea plant is of 3 to 4 yeas old. Best plucking time or stageΒ for tea harvesting is β¦β¦β¦β¦β¦β¦β¦β¦β¦β¦β¦οΏ½...
Which of the following is essential for nursery record-keeping?
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Priming of seeds before sowing is done to:
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