Mountain Biking

Algebra Level 2

Sunny goes mountain biking every Saturday. The trail is 9696 km long, and is uphill all the way to the top.
His uphill speed is 1616 km per hour slower than his normal speed.
His downhill speed is 88 km faster than his normal speed.
If a round trip on the trail takes 66 hours, what is his normal speed (in km/h)?

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