Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
Tony exercises every morning by walking 3 miles carrying a 25-pound backpack, then he runs another 10 miles without the backpack.  If he walks at a speed of 3 miles per hour and runs at a speed of 5 miles per hour, how many hours each week does he spend exercising?

### Response:
 Tony anatembea maili 3 kwa kasi ya maili 3 kwa saa kwa saa 1.
Tony pia anakimbia maili 10 kwa kasi ya maili 5 kwa saa kwa saa 2.
Hivyo, kila siku anafanya mazoezi kwa masaa 1+2=<<3=3>>3.
Kwa muda wa wiki moja, anafanya mazoezi kwa masaa 3*7=<<3*7=21>>21.