Mr and Mrs Porter drove down to see Sweeney. Mr Porter drove the first 20 km on the way there, and Mrs Porter drove the rest of the way. On the return journey, she drove the first 30 km and he drove the rest. How much farther did Mrs Porter drive than Mr Porter?
Correct answer: C. 20 km
- A. No farther
- B. 10km
- C. 20 km
- D. There is not enough information to work it out
Explanation
Distance to sweeney = xMr. Porter drove 20 km on the initial journey, and (x-30) km on the return journey.Total distance Mr. Porter drove = 20 + x - 30 = (x-10) kmMrs. Porter drove (x-20) km on the initial journey, and 30 km on the return journey.Total distance Mrs. Porter drove = x - 20 + 30 = (x+10) kmDifference between total distance of Mrs. Porter and Mr. Porter=(x+10) - (x-10)= x + 10 - x + 10=20 kmTherefore, the answer is option C.
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Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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