Chosen Solution

Is it possible to charge your Iphone that supports magsafe with magsafe and use the iphone 35 watt fast charger block at the same time?

No. its not. you can connect both. but it WILL ONLY charge using the cable. this is done to primarily to protect the battery.

nope it will not increase the charging speed, it will shift to the charger that was plugged after the first one