This graph shows a commuter's journey to work. His journey consists of two stages of travel separated by a break of 30 minutes. a) What was his speed (in km/h) during the first stage of his journey? b) What was his speed (in km/h) during the second stage of his journey?

here's how to calculate the speed for each stage of the journey from the distance-time graph. Speed is calculated as the change in distance divided by the change in time. a) Step 1: Identify the distance and time for the first stage. The first stage of the journey starts at 07:00 with 0 km distance and ends at 07:30 with 4 km distance. Step 2: Calculate the distance covered and time taken. Distance covered ( d) = 4 km - 0 km = 4 km Time taken ( t) = 07:30 - 07:00 = 30 minutes Step 3: Convert time to hours. 30 minutes = (30)/(60) hours = 0.5 hours Step 4: Calculate the speed for the first stage. Speed = ( d)/( t) = 4 km0.5 hours = 8 km/h The speed during the first stage was 8 km/h. b) Step 1: Identify the distance and time for the second stage. The journey has a break from 07:30 to 08:00. The second stage of travelling starts at 08:00 with 4 km distance and ends at 08:30 with 9 km distance. Step 2: Calculate the distance covered and time taken. Distance covered ( d) = 9 km - 4 km = 5 km Time taken ( t) = 08:30 - 08:00 = 30 minutes Step 3: Convert time to hours. 30 minutes = (30)/(60) hours = 0.5 hours Step 4: Calculate the speed for the second stage. Speed = ( d)/( t) = 5 km0.5 hours = 10 km/h The speed during the second stage was 10 km/h. Got more? Send 'em!