Question
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 7 km/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?Solution
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 = 15 km/hour ∴ Speed of Boat must be 15 km/hour.
The environment impact assessment consists of a mimber of steps with each step equally important in determining the overall performance of the project. ...
Where are the headquarters of RBI located?
In which year was the Khalsa tradition initiated?
Which was the largest of the numerous native states before independence?
When the branch of a tree is shaken violently, the leaves fall. This happening can be explained by:Â
A government budget shows a primary deficit of ₹6,900 crore. The revenue expenditure on interest payment is ₹400 crore. Fiscal deficit is equal to:
The Bara Imambara in Lucknow was built in the year 1784 by ________.
Which of the following is the Largest Cricket Stadium in the world?
Who was the first Indian to become a Nobel Laureate?
ASBA is an application containing an authorization to Self-Certified Syndicate Bank. What does B stand for in ASBA?
Relevant for Exams:
