Suppose you are driving to school from your home. During the first 15 minutes you drove with an average speed of 40 miles/hour. Then you realized that you are getting late and started driving at a speed of 50 miles/hour. If the distance between your home and school is 35 miles how long you will take to reach your school? 45 mins O Can not be determined O 30 mins 27 mins O 15 mins

45 mins

Explanation:

First phase:

v = speed of driving = 40 mph

t = time spent = 15 min = 0.25 h

d = distance traveled

distance traveled is given as

d = v t

d = 40 x 0.25

d = 10 miles

Second phase:

D = remaining distance to be traveled = 35 - 10 = 25 miles

v = speed of driving = 50 mph

t = time spent

remaining distance traveled is given as

D = v t

25 = 50 t

t = 0.5 h

t = 30 min

T = Total time taken to reach the school

Total time taken is given as

T = 15 + 30

T = 45 min