I drove 100km from a to b in 1 hour,and back from b to a in 2 hours.whats my average speed?

or:I drove 100km from a to b in 1 hour,and back from b to a in 2 hours.whats my average speed?or:100km

or:I drove 100km from a to b in 1 hour,and back from b to a in 2 hours.whats my average speed?

or:100km

Tags:speed,