A motor boat goes downstream from point A to B ,which is 36 km away from point A, and then returns to A. If actual speed of the boat in still water is 7km/hour ,and the total upstream and downstream journey takes 21 hours .What must be the actual speed of boat for the journey from A to B to take exactly 108 minutes ?
Speed of boat in still water is 7km/hour Let the Speed of Stream be x Km/hour 36/(7+x) + 36/(7-x) = 21 24 = 49- x2 x = 5 km/hour Now, the speed of Boat for the journey from A to B to take time 108 minutes is Speed of boat = y km/hour , Speed of stream = 5km/hour , Time = 108 minutes (y+5) = (36×60)/108 = 20km/hour y+5 = 20 y = 15km/hour ∴ Speed of Boat must be 15km/hour
What is the protein content of Barley?
Which fish can be easily grown in brackish water with quick growth rate and can tolerate the fluctuations in temperature?
Ozone concentration in the atmosphere is reduced by
Match list 1 with list II
In angiosperms, the phloem is made up of which of the elements?
Reclamation disease caused by copper deficiency occurs in cereal plants grown on recently reclaimed acidic soil
Where are the headquarters of ICAR located
Ability of plants to maintain a favourable internal water balance under moisture stress is known as
The highest number of cut roses are sold on which day?
Plant parasitic nematodes feed on the of the Plant ?