Problem 11

Explanation

Let:

• $J_A =$ Distance traveled by Ali until they meet
• $J_T =$ Distance traveled by Tika until they meet
• $v_A =$ Ali's speed $= 60$ km/h
• $v_T =$ Tika's speed $= 70$ km/h

Since Ali and Tika depart at the same time, the time they take to meet is also the same. Let $t =$ time.

Then:

Since the total distance is $221$ km, then:

So the time required until they meet is:

Thus, they will meet at: