Biking with Trailer, Novice question

[Luckie]

Hi Thanks for viewing!!! This will be my first attempt to bike and picking my preschooler up from school with a toddler in tow. The preschool is about 4 miles there and back. I need to get there and back at a certain time to make dinner for the kiddos. The trailer is about 37 lbs, toddler is about 23 lbs and preschooler about 30 lbs, totalling about 90 lbs and I'm 110 but very active. The terrain is quite hilly. Am I correct to assume that it can't take me more than 20mm to get there? I assume this because I tried to jog there with a double stroller but my watch kept telling me that I was at 20mm (I meant 20 minutes per mile) and it was a total fail because I wound up having to go back for the car. TIA!

[skunkfunk]

I know it'd take me more than 20! That's going to be a nice workout, much better than 4 miles by yourself.

[jda1984]

I find that a trailer with properly inflated tires and our two kids slows me down about 2-3 mph cruising speed.  More of the effect is felt at stop lights, turns, etc. when you need to slow down significantly.  The hills will also be a big impact area.  If you normally average 15-16 mph over the same 4 mile route, you'll probably be close to the 20 minute range (15mph-3mph=12mph, or 5 minutes per mile.  5 min/mi*4mi=20min).

[Luckie]

I find that a trailer with properly inflated tires and our two kids slows me down about 2-3 mph cruising speed.  More of the effect is felt at stop lights, turns, etc. when you need to slow down significantly.  The hills will also be a big impact area.  If you normally average 15-16 mph over the same 4 mile route, you'll probably be close to the 20 minute range (15mph-3mph=12mph, or 5 minutes per mile.  5 min/mi*4mi=20min).

This is awesome, I think i can do this, when I posted 20mm I meant 20 mins per mile (I'm use to running so mm is min per mile) which would be 80 minutes per 4 miles and I didn't want that. BUt if I can make it there and back even at the slowest pace on a bike to be under an hour, I'll take it

[Luckie]

I know it'd take me more than 20! That's going to be a nice workout, much better than 4 miles by yourself.

wehn you say it'll take you more than 20, does that mean it'll take you more than 20 mins per a mile or per the 4 miles?