#### Ebba Sen Pai

##### New member

- Joined
- Jun 15, 2018

- Messages
- 8

Question:

A man walks at the rate of 4 miles per hour. How far can he walk into the country and ride back on a trolley that travels at the rate of 20 miles per hour, if he must be back home 3 hours from the time he started?

My Solving Attempt:

Rate\/ Time \/

**Distance \/**

__________________________

Walk | 4 | 3-t |

**12-4t**| (I find

**distance**by multiplying rate x time)

Trolley | 20 | t |

**20t**|

------------------------------

(I write as algebraic formula)

12-4t=20t (I add 4 to both sides)

12=24t (I divide both sides by 24)

**0.5=t**

My book says the correct answer is 10

Where have I gone so wrong?