When a number is decreased by 40% of itself, the result is 18. What is the number

What values of c and d make the equation true?

When the ball has traveled a distance of

Cody started biking to the park traveling 15 mph, after some time the bike got a flat so cody walked the rest of the way, traveling 4 mph. if the total trip to the park took 6 hours and it was 46 miles away, how long did cody travel at each speed? solve using rate times time= distance