Question
Before rain a boat can cover 90 km in still water and
the same distance upstream in 6 hours and 9 hours, respectively. Due to the rain the speed of the stream increased by 20% and the speed of the boat decreased by (1/3) of its initial speed. Find the difference of time taken by the boat to travel 176 km downstream and 76 km upstream .Solution
Let the speed of the boat in still water by x km/hr and speed of the stream be y km/hr. As per the question Time taken by the boat to cover 90 km in still water = (90/x) = 6 x= 15km/hr Time taken by the boat to travel 90 km in upstream = (90/15-y) = 9  = 90 = 135-9y  = 9y = 45   = y = 5 km/hr. Change in speed of boat and stream Boat = 15*(2/3) = 10 km/hr Stream = 5*(6/5) = 6 km/hr. Speed downstream = 10+6 = 16 km/hr. Time taken by boat to cover 176 km = 176/16 = 11 hr. Upstream speed = 10-6 = 4 km/hr. Time taken by boat to cover 76 km = 76/4 = 19 hrs Required difference = 19hr – 11 hr. = 8 hrs.
Her parents were (A)/not interest in spending (B)/money on her education (C).
Directions: In each of the questions, a sentence has been divided into four parts, one of which may contain an error. Identify that fragment and mark i...
Either my brother or his friends is lying.
Less of 10 per cent of (1)/ global climate finance and (2)/ only 1.2 per cent of humanitarian (3) /funding reaches local actors in cities.(4)
The decision to cut the prices were taken after a fortnightly review meeting of the oil companies.
The concept of ugly 1)/ and beautiful 2)/ are interchangeable 3) /and relative 4) /5)
Read the sentence to find out whether there is any grammatical or idiomatic error in it. The error, if any, will be in two parts of the sentence. Mark ...
In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate optio...
Despite incessant rains, she is the only one who plan to attend the meeting at the ministry.
Identify the segment in the sentence, which contains the grammatical error
No matter he tries hard he cannot play the guitar.
Relevant for Exams:
