Time and Distance Practice Test 3 with solutions

Question : 3 of 40

Marks: +1, -0

A girl rides her bicycle 10 km at an average speed of 12 km/hr and another 12 km at an average speed of 10 km/hr. Her average speed for the entire journey is approximately:

12.2 km/hr
11.2 km/hr
10.8 km/hr
10.4 km/hr

Validate

Solution:

Average speed =

{10+12}/{{10}/{12}+{12}/{10}}

{22}/{{61}/{30}}

{22×30}/{61}

{660}/{61}

= 10.8 km/hr.

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