Albert left his house on his bicycle riding at an average rate of 10 mph three hours before his son left by automobile his son overtook him. Albert in exactly 30 minutes at what average rate was Albert some traveling

In 3 hours, at 10 mph, Albert travels 30 miles. In 10 minutes (1/6 hr), while his son overtakes him, he travels 10/6 miles more, placing him at 30 + 10/6 = 190/6 = 95/3 mi.

His son covers 95/3 mi in 1/6 hr, so he's moving at (95/3) / (1/6) = 190 mph.