Question
The speed of a boat going upstream is 20% slower than
when it is traveling downstream. The boat travels 90 km in still water over a period of 4 hours. Calculate the time required for the boat to cover distances of 120 km upstream and 125 km downstream.Solution
Speed of the boat in still water = 90/4 = 22.5 km/h Let the speed of the stream = x km/h So according to question: 0.80 × (22.5 + x) = 22.5 – x 18 + 0.8x = 22.5 – x 1.8x = 4.5, x = 2.5 Upstream speed of the boat = 22.5 – 2.5 = 20 km/h Downstream speed of the boat = 22.5 + 2.5 = 25 km/h Time taken by the boat to cover 120 km upstream and 125 km downstream = 120/20 + 125/25 = 6 + 5 = 11 hours
The comfortable chaise in the corner of the room was her favourite spot to ____ with a good book and relax.
A perception among the country’s youth that the national government is __________ down on democratic expression could only strain the already delicate...
The government notes that business establishments are increasingly reliant on private investigators for gathering information and intelligence. Therefor...
Select the most appropriate option to fill in the blank
It means staying ___________ with emerging technologies and latest technology trends....
The amount of water ________ by the United Nations for drinking, washing, cooking and ________ proper hygiene is a minimum of 50 litres per person per ...
Fill in the blanks:
Though their design was ___________ in the 1950s for newer technological developments, Stanford scientists are ___________ it t...- Select the most appropriate option to fill in the blank.
The team was determined to complete the trek, come _____ or high water.
... Fill in the blanks with appropriate words/phrases from the options.
The government said the expansion of the vaccination drive to ____________ al...
Patoonda is a small village situated …….. the rocky barren land on the right bank of river Kali Sindh, a major …… of Chambal...
Arriva has operated _____ number of rail franchises in the UK since privatisation in 1996 though its subsidiary, Arriva UK Trains.
Relevant for Exams:
