Math
Two cities, Kensington, MD and Reston, VA are 30 km apart. From both of these cities, simultaneously, two hikers start their journeys towards each other. They are walking at a constant speed of 5 km/hour each. Simultaneously, a fly leaves the city of Kensington. It flies at the speed of 10 km/hour and passes the hiker from its city. When it reaches the Reston hiker, it turns around and flies back to the Kensington hiker. It keeps doing so until the hikers meet. If the fly lands on the shoulder of the Kensington hiker as he continues his journey to Reston at the moment the two hikers meet, how many kilometers has the fly flown?
A. 25
B. 30
C. 37.5
D. 45
E. 60
Correct Answer - B - (click and drag your mouse to see the answer)
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Verbal
Studies have shown that regularly used household washing machines are teeming with bacteria that find their way onto our clothes and consequently onto us, causing various bacterial infections. Rinsing these machines with bleach is an effective way to get rid of such bacteria. However, certain other studies have shown that bleach, when used in the undiluted form, can severely corrode the metal drum in the machines. Thus, bleach, as long as it is diluted properly, is an effective means of eliminating any health risks from such washing machines, with no harmful effects on these machines.
Which of the following, if true, weakens the argument above?
A. Studies have shown that besides bacteria, many other kinds of pathogens can be found in regularly used washing-machines.
B. Undiluted bleach is not more powerful than diluted bleach in killing bacteria.
C. Many companies come with gentle bleach blends that do not corrode the metal drum of the household washing machines.
D. Various studies have shown that certain bacteria can live outside the human body for long periods of time on various objects such as clothes, toys etc.
E. Most household washing machines come with a hot-water cycle that is set at a temperature of 90 degrees Celsius, a temperature that has been cited as ideal for killing various disease-causing bugs in these machines.
Correct Answer - A - (click and drag your mouse to see the answer)
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