How much longer will it take to travel a distance of 6ookm at
a speed of 50kmh than it
would at a
speed of 6okmh?

2hr much longer

Explanation:

Given parameters

  Distance  = 600km

   Speed 1  = 50km/h

   Speed 2 = 60km/h

Unknown:

How much longer will it take to travel a distance  = ?

Solution:

  Speed is the distance divided by time;

          Speed  =  

 Now;

           Time taken  =  

Time 1;

                        =

                       = 12hr

Time 2;

                       =

                       = 10hr

To find how much more time;

            Time 1 will take 12hr - 10hr, 2hr much longer to travel the distance at that rate.

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.