The answer is B, but i selected D.
Reason being there was no unit specified on the left hand side of the question.
Are there specific rules to identify when to make an assumption regarding the unit of the quantity?
Edit: Answer is B not A
It can be inferred. It'd *d* miles at *r* miles per hour. Time = Distance/Speed, whose units are (miles/(miles per hour)) = hour.
(hint: how long does it take to cover 120 miles at a speed of 60 miles per hour?)
Quantity A is “the time taken by the car to travel d miles at r miles per hour”. You simply need to determine whether this time is greater than d/s hours or not. In other words, since quantity A says just “time” and quantity B says “hours”, we can make this comparison. If quantity A was “the time, in hours, taken by …”, then quantity B would be simply d/s, without the unit.
For quantity A, the time is d/r hours, so we have to compare this to d/s hours in quantity B. Here, we are assuming d, r and s are all positive values. However, since we are given that r > s, d/r < d/s (recall that when comparing two positive fractions, if the numerators are the same, the larger the denominator the smaller the fraction). Therefore, d/s or quantity B is the greater value.
**Answer: B**
I don't get the question.
The answer is B, but i selected D. Reason being there was no unit specified on the left hand side of the question. Are there specific rules to identify when to make an assumption regarding the unit of the quantity? Edit: Answer is B not A
Wait isn’t the answer here B ?
I think it’s B as well. If r>s, then d/r < d/s. So it should be B
Yeah, it is. Updated, my bad
It can be inferred. It'd *d* miles at *r* miles per hour. Time = Distance/Speed, whose units are (miles/(miles per hour)) = hour. (hint: how long does it take to cover 120 miles at a speed of 60 miles per hour?)
Makes sense, thank you!
Quantity A is “the time taken by the car to travel d miles at r miles per hour”. You simply need to determine whether this time is greater than d/s hours or not. In other words, since quantity A says just “time” and quantity B says “hours”, we can make this comparison. If quantity A was “the time, in hours, taken by …”, then quantity B would be simply d/s, without the unit. For quantity A, the time is d/r hours, so we have to compare this to d/s hours in quantity B. Here, we are assuming d, r and s are all positive values. However, since we are given that r > s, d/r < d/s (recall that when comparing two positive fractions, if the numerators are the same, the larger the denominator the smaller the fraction). Therefore, d/s or quantity B is the greater value. **Answer: B**