Posted by Stella on .
A tortoise can run with a speed of 10.1 cm/s, and a hare can run 19.4 times as fast. In a race, they both start at the same time, but the hare stops to rest for 122 seconds. The tortoise wins by a shell (20.8 cm).
How long does the race take?
What is the length of the race?

Physics 
Alex,
tortoise= 10.1 t
hare= 195.94(t122)
tortoise  hare= 10.1t  195.94t + 23904.68 = 20.8
Solve for t
23883.88 = 185.84 t
t = 128.5185 s
tortoise t= (10.1)(128.5185)= 129.036 cm