Return now to the fifth grade and the dreaded word math problem:
A tourist is driving her car up a mountain. In one hour, traveling 30 miles per hour, she reaches the top of the mountain, whereupon she suddenly remembers that she forgot her camera. She immediately turns around and drives downhill at 60 mph.
Assuming she spent no time at the top, what was her average speed?
A tourist is driving her car up a mountain. In one hour, traveling 30 miles per hour, she reaches the top of the mountain, whereupon she suddenly remembers that she forgot her camera. She immediately turns around and drives downhill at 60 mph.
Assuming she spent no time at the top, what was her average speed?