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
Related Maths GCSE answers
All answers ▸Solve the simultaneous equations: 5x+y=21, x-3y=9
A ship sets off on a bearing of 072 degrees from port and travels 3.4km in a straight line. How far north of the ship's starting position is its final position? Give your answer to two decimal places.
Factorise the following equation: y = 2x^2 + 4x - 6
Jon and Nik share money in the ratio 5 : 2 Jon gets £150 more than Nik. How much money do they share altogether?