Question
The ratio of the speed of boat in upstream to speed of
boat in downstream is 7:9. If the boat can cover a total of 119 km upstream and 162 km downstream in 7 hours, then find the time taken by the boat to cover 180 km in still water.Solution
Let speed of boat in upstream and downstream be โ7xโ km/h and โ9xโ km/h respectively. 119/7x + 162/9x = 7 17/x + 18/x = 7 35 = 7x x = 5 Speed of boat in still water = (7x + 9x)/2 = 8x = 8 ร 5 = 40 km/h Desired time = 180/40 = 4.5 hours
In banana bunch management, the practice of โproppingโ is used for what primary purpose?
"Pitcher Irrigation" is an ancient method especially useful for:
Pre-cooling of fruits and vegetables is typically done at what temperature range?
What is a major advantage of using seed trays?
Which of the following methods is used to determine the field capacity of a soil in laboratory conditions?
The pineapple, a commercially important tropical fruit, is believed to have originated in which country?
Which state in India has the highest area under protected cultivation?
The commercial propagation of 'Saffron' is done through:
The primary use of Isabgol (Plantago ovata) husk is:
The โsuckersโ used for propagation of tuberose originate from which part of the plant?