Question

Jessica is running a 10K. She alternates between running and walking each kilometer. She runs at a rate of 1 kilometer every 5 minutes. She walks at a rate of 1 kilometer every 15 minutes. How long does it take her to complete the race?

a.85 minutes
b.50 minutes
c.100 minutes
d.75 minutes

Answer 1

Answer is 100 minutes...

coz I solved it in the test...

Answer 2

c.100 minutes

Step-by-step explanation:

Total distance = 10 km

Runs for 1 km every 5 minutes

walks 1 km every 15 min

She alternates between walking and running so, Jessica will walk 5 km and run 5 Km

Time taken by Jessica for walking : 5 km

Time taken to walk 1 km=5 minutes

Time taken to walk 5 km

=> 5 X 5

=>25 minutes

Time taken by Jessica for Running : 5km

Time taken to run 1 km = 15 minutes

=> 5 X 15

=>75 minutes

Total time taken = Time taken by Jessica for walking + Time taken by Jessica for Running

=>25 minutes +75 minutes

=> 100 minutes