Hello,
I really have troubles understanding how to solve this question, even when I look through the solution, I hope you can help me!
Andy and Frank start out at opposite ends of a 450-mile route, cycling toward each other at their respective constant rates. Frank cycles at 15 miles per hour and Andy cycles at 25 miles per hour. If Andy leaves at 6am and Frank leaves at some point after that, which combination below represents a time at which Frank begins his ride and a time at which the two will meet along the route?
The different options for when Frank begins his ride and when the two meet are the following:
8:00am
9:00am
10:00am
12:00pm
6:30pm
7:00pm
7:30pm
- And so you have to choose two options; one where Frank leaves, and one where they meet each other.
In the suggested solution it is stated that:
For a question like this, it can be helpful to set up your own grid, noting the times that Frank can leave, the distance Andy will have traveled at that point,the distance they'll need to cover together, and the time at which they'll have covered that distance (working at their combined rate of 40 miles per hour):
I really don't understand this approach. So do you have to work on the problem like it is a double distance, (900 miles?)
Many thanks in advance,
Br.
I really have troubles understanding how to solve this question, even when I look through the solution, I hope you can help me!
Andy and Frank start out at opposite ends of a 450-mile route, cycling toward each other at their respective constant rates. Frank cycles at 15 miles per hour and Andy cycles at 25 miles per hour. If Andy leaves at 6am and Frank leaves at some point after that, which combination below represents a time at which Frank begins his ride and a time at which the two will meet along the route?
The different options for when Frank begins his ride and when the two meet are the following:
8:00am
9:00am
10:00am
12:00pm
6:30pm
7:00pm
7:30pm
- And so you have to choose two options; one where Frank leaves, and one where they meet each other.
In the suggested solution it is stated that:
For a question like this, it can be helpful to set up your own grid, noting the times that Frank can leave, the distance Andy will have traveled at that point,the distance they'll need to cover together, and the time at which they'll have covered that distance (working at their combined rate of 40 miles per hour):
I really don't understand this approach. So do you have to work on the problem like it is a double distance, (900 miles?)
Many thanks in advance,
Br.
