Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized for You
we will pick new questions that match your level based on your Timer History
Track Your Progress
every week, we’ll send you an estimated GMAT score based on your performance
Practice Pays
we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
75% (01:20) correct 25% (02:42) wrong based on 114 sessions
HideShow timer Statistics
A train traveling at a certain constant speed takes 30 seconds longer to travel 2 kilometers than it would take to travel 4 kilometers at 120 kilometers per hour. At what speed, in kilometers per hour, is the train traveling?
A train traveling at a certain constant speed takes 30 seconds longer to travel 2 kilometers than it would take to travel 4 kilometers at 120 kilometers per hour. At what speed, in kilometers per hour, is the train traveling?
A. 24 B. 40 C. 48 D. 96 E. 120
Time to travel 4 kilometers at 120 kilometers per hour is \(\text{time}=\frac{\text{distance}}{\text{rate}}=\frac{4}{120} \text{hours} = \frac{4*3,600}{120} \text{seconds} = 120 \text{seconds}\);
Time to travel 2 kilometers at a regular speed is \(120+30 = 150 \text{seconds} = \frac{150}{3,600} = \frac{1}{24} \text{hours}\);
So, the speed of a train is \(\text{rate}=\frac{\text{distance}}{\text{time}}=\frac{2}{(1/24)}=48\) kilometers per hour.
close
75% (01:20) correct 
