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 Β = 90 = 135-9y Β = 9y = 45 Β Β = 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 β 11 hr. = 8 hrs.
After all the media attention, the event turned out to be a damp squib and very few people attended it.
In each of the following questions, an idiomatic expression/a proverb has been underlined β followed by four alternatives. Choose the one which best ...
I remember him saying that a juvenile judge without the support of a social worker would be like a fly out of basket .
Select the most appropriate meaning of the given idiom.
To take pains
- Select the most appropriate meaning of the bold idiom in the following sentence.
After the merger, the CEO knew he had to face the music for the co... Doozy
In the following question a proverb/idiom us given. Select the option that best describes the meaning of the given proverb/idiom.
Under the weat...
In the following questions, four alternatives are given for the idioms/phrases. Choose the one which best expresses the meaning of the given idiom/phra...
Charley Horse
In each of the following questions a statement has been given with highlighted idioms. You are required to choose the meaning of the idioms from the op...