It is 170 miles from Bruce's house to the city where his brother lives. On his last trip to visit his brother, he drove for 2 hours at 55 miles per hour. Then he came to some very bad road construction. The rest of the trip took 2 hours. How many miles per hour did Bruce drive for the rest of the trip?
170 m - 55 m/hr * 2 hr = 170 - 110 = 60 miles
He drove through the 60 miles of construction in 2 hours
60 m / 2 hr =......... m/hr