A trip to a nearby island takes 3 and one half hours by boat and one half hour by airplane. How many times as fast as the boat is the​ plane?

Answer 1

We divide time of airplane by time of boat

3 and 1/2 is equal 7/2

1/2 divide by 7/2 = 1/2 * 2/7 = 7 times

Answer 2

1/2 times x = 3 1/2 hours

x/2 =7/2 solve for

x= 2(7/2) = 7 times as fast