Question

1. how long (in seconds) will it take you to run 100 meters if you run at 5 m/s?
2. a boat sails at an average speed of 20 km/h for two days. how far does the boat go?

Explanation:

Step1: Recall speed - distance - time formula

The formula is $t=\frac{d}{v}$ for the first question and $d = v\times t$ for the second question, where $d$ is distance, $v$ is speed and $t$ is time.

Step2: Solve the first question

Given $d = 100$ m and $v=5$ m/s. Substitute into $t=\frac{d}{v}$, we get $t=\frac{100}{5}=20$ s.

Step3: Convert time for the second question

Two days in hours: 1 day has 24 hours, so 2 days have $2\times24 = 48$ h.

Step4: Solve the second question

Given $v = 20$ km/h and $t = 48$ h. Substitute into $d=v\times t$, we get $d=20\times48 = 960$ km.

Answer:

1. 20 s
2. 960 km