Question

A student drives to the beach at constant speed of 45.0 km/hr (in LA traffic, don’t think too hard about this...), except for a 6.0-minute stop for gas. If her average speed for the trip is 32.5 km/hr, (a) how far does she travel and (b) how long does it take her to get to the beach?

Show Work for answers (a) 11.7km and (b) 21.6 min

Answer 1

The average speed is given hence we can calculate the total time taken for the trip from the given data. Let us say that the car runs for t1 time at 45 km/hr and t2 time at 0km/h (t2 is 6 min here). Hence we can calculate the average speed as,

Substituting values we get the equation as, (minutes are converted to hours)

(a) Therefore the distance travelled by her can be calculated as,

(b) The total time taken for the trip is,