Didn’t understand the solution provided ! Please help !
David when traveling at a certain speed takes 2 seconds longer to travel a mile than it would take to travel at 200 miles per hour. At what speed, in miles per hour, is David traveling?
- 179
- 179.2
- 180
- 180.2
- 180.5
Hi Chaitanya,
This is a rate question, basically it tests the conversion of miles per hour to miles per seconds.
Here it is given that,
200 miles per hour, so let’s convert this to seconds.
1 hour = 3600 seconds,
So
200 miles he is taking 3600 seconds,
So, for 1 mile it will take 18 seconds,
Here question says, David takes 2 seconds longer than traveling with a speed of 200 miles per hour.
So David travelling at a certain speed takes 20 seconds to travel a mile.
1 mile = 20 seconds means,
Multiply both sides with 180,
180 miles = 3600 seconds (1 hour = 3600).
So David speed in miles per hour is 180.
So the answer would be C.
Hope this is clear