Tony's family wants to arrive at the family reunion at 5:00pm for the supper that is being planned. Driving time will be about 6hours 30 min. They plan to stop for gas one time for 10 min. They also plan to stop for lunch for about 45 min. At what time should they leave. In order to arrive by 5:00pm.

Tony's family should start by 9 : 35 am

Solution:

Given that,

Tony's family wants to arrive at the family reunion at 5:00 pm for the supper that is being planned

From given question,

Driving time = 6 hours 30 minutes

Stop for gas one time = 10 minutes

Lunch = 45 minutes

Calculate the total time taken for driving, gas and lunch

⇒ 6 hours 30 minutes + 10 minutes + 45 minutes

⇒ 6 hours 30 minutes + 55 minutes

⇒ 6 hours + 85 minutes

⇒ 6 hours + 60 minutes + 25 minutes

[ since 85 minutes can be written as 60 + 25 minutes ]

We know that,

1 hour = 60 minutes

Therefore,

⇒ 6 hours + 60 minutes + 25 minutes = 6 hours + 1 hour + 25 minutes

⇒ 7 hour 25 minutes

So the total travel time is about 7 hours 25 minutes

If they need to arrive at 5 : 00 pm, then they should start by 9 : 35 am

Because,

Difference between 5 : 00 pm and 9 : 35 am = 7 hours 25 minutes

So Tony's family should start by 9 : 35 am