At 8am, ming wei started travelling from town a to town b. at 8: 40am, ali started travelling from town b to town a. mingwei's speed and ali's speed were 45km/h and 35km/h respectively. they did not change their speeds throughout the journey. when they met each other, their distance from town a was twice their distance from town b. find the distance between town a and town b.

Let's write some equations.

Mingwei's distance from Town A after hours from 8:00 is .

Ali's distance from Town B after hours is , since he doesn't start walking for 40 minutes.

When Mingwei's distance is twice Ali's, they've met up (since their distance from Town A is twice their distance from Town B).

So, this gives , so , so , so the time is 10:40.

After hours, Mingwei has traveled kilometers while Ali has traveled sixty, so the distance between the towns is kilometers.