6. Tina has to walk to the shop to buy milk. After walking 150 m, she realizes that sh
does not have enough money, and goes back home. If it took her two minutes to
leave and come back home. If it took her two minutes to leave and come back,
calculate the following:
a.
The time interval (t in seconds) she was out of the house;
b. The total distance (d) that the walked;