Question
The ratio of the speed of boats ‘A’ and ‘B’ in
still water is 8:9, respectively. The speed of the current is 25% of the speed of boat ‘A’ in still water. If boat ‘A’ takes 9 hours to travel 810 km downstream, then find the time taken by boat ‘B’ to travel 252 km upstream and 792 km downstream. (Note: Both the boats are rowing in the same stream.)Solution
Let the speeds of boats ‘A’ and ‘B’ in still water be 8x km/hr and 9x km/hr Therefore, speed of the current = 0.25 × 8x = 2x km/hr According to the question, 8x + 2x = 810/9 Or, 10x = 90 Or, x = 9 Therefore, upstream speed of boat ‘B’ = 9x – 2x = 7x = 63 km/hr Downstream speed of boat ‘B’ = 9x + 2x = 11x = 99 km/hr Required time taken = (252/63) + (792/99) = 4 + 8 = 12 hours
Fill in the blank with appropriate article. I couldn't believe my eyes when I saw ____________ elephant crossing the road in front of my school yesterday.
The Fenian element was with him, as he admitted, but the clergy were against him, and the odds ____________ too great, especially against a Protestant p...
Select the most appropriate option to fill in the blank
It means staying ___________ with emerging technologies and latest technology trends....
Don’t worry, we’ll _______ when we get there.
This is the first economic survey after the Goods and Services Tax (GST) was ________ last year.
(A) discussed      (B) implemented...
Each of the sentences below has two of three blanks along with five options. You have to choose the option that provides the correct set of words that ...
Each question below has two blanks, which is indicating that something has been omitted. Choose the most suitable option indicating the words that can ...
Choose the correct answer to fill the given blank
She _____ to the party last night.
Mohnish and Ravi _____ to Canada next month. Â
In these questions a sentence is given with a blank and you have to choose an appropriate word from the given options that can fill the sentence making...
