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?

It takes Jessica 100 minutes to complete the race

Explanation:

Given:

Total distance = 10 km

Runs for 1 km every 5 minutes

walks 1 km every 15 min

Explanation

It is given that she alternates between walking and running

so Jessica will walk 5 km and run 5 Km

Time taken by Jessica for walking

she walks 5 km

time taken to walk 1 km = 5 minutes

now time taken to walk 5 km

=> 5 X 5

=>25 minutes

Time taken by Jessica for Running

she Runs 5 km

Time taken to run 1 km = 15 minutes

Now time taken to run 5 km

=> 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