Speed (Interconversion between units of time)：練習問題

Express \( 45 \) minutes as a fraction of an hour in its simplest form.

A car travels \(150\) km in \(2\) hours and \(30\) minutes. What is the average speed of the car in km/h?

An athlete runs at a speed of \(8\) m/s. How long does it take for the athlete to run a distance of \(1.2\) km? Give your answer in minutes and seconds.

A sprinter runs \(100\) metres in \(10\) seconds. What is the speed of the sprinter in m/s?

Convert \(2\) hours and \(15\) minutes into seconds.

How many seconds are there in 4 minutes and 15 seconds?

Convert \( 2 \frac{3}{5} \) hours into minutes.

Express the sum of \( 0.4 \) hours, \( 15 \) minutes, and \( 120 \) seconds in minutes.

A runner took exactly \( 1 \) minute and \( 45 \) seconds to complete a lap around a stadium.
(a) How many seconds in total did the runner take to finish the lap?
(b) If the runner maintains this exact pace for \( 4 \) laps, how many minutes and seconds will the total time be?

A high-speed train travels between City A and City B. To plan the schedule, a technician needs to analyze the travel times in different units.

a) If the journey from City A to City B takes 150 minutes, express this time in hours as both a decimal and a mixed number.
b) On the return journey, due to a delay, the train takes 2.75 hours. How many minutes does the return journey take?
c) A secondary maintenance check takes 450 seconds. Express this duration in minutes.