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Two buses leave the bus terminal at 4pm. The first bus completes its route in 20 minutes. The second bus its route in 35 minutes. At what time will they be back at the bus terminal together again?

 Mar 28, 2020
 #1
avatar+23541 
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LCM of  20 and 35 is  140 minutes           2 hr   20 minutes   past  4 PM =.......

 Mar 28, 2020
 #2
avatar+1948 
+1

The LCM of 20 and 35 is 140. Therefore, they meet again in 140 minutes.

 

That will be at 6:20 PM.

 Mar 28, 2020

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