Joan cycles from her house to a shop 900 m away. She then cycles to her friends' house 700 m away. The average speed for the first part of her journey is 2 m/s. The second part takes her 16 mins. What is the average speed for her entire journey?
S: 900 700D: 2 m/sT: 960s
Need to find speed in seconds so convert 16 mins to seconds.
To find average, we must find time for the first part. Using the basic D/S, the time is 900/2 = 450 s.Speed for the second part is 700/960 = 35/48.
The average is worked out as following: [ 2(450) + 35/48 (960) ] / ( 450 + 960) = 1.13 m/s to 3 sig figs.
AR
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