As my husband and I were finishing preparations to host an event, some of our guests showed up 90 minutes early. Fortunately I was dressed. But I was too frazzled to say anything. What would you do?

The duration of time that has passed is 90 minutes or one and a half hours. When working out problems like this, we can think forwards or backwards in full hours, half hours, quarters or three ...

Researchers found that kids who spent more time watching TV or online had lower levels of social and language skills than the average.