## Exam-Style Question on Standard Form## A mathematics exam-style question with a worked solution that can be revealed gradually |

Question id: 538. This question is similar to one that appeared on a GCSE Higher paper in 2019. The use of a calculator is allowed.

At a particular time the distance between Earth and Mercury was \(7.7 \times 10^7\) km.

A signal was sent from Earth to Mercury travelling at an estimated speed of \(3 \times 10^5\) km per second.

(a) how long did the signal take to get to Mercury?

The speed of the signal sent from Earth to Mercury was actually less than \(3 \times 10^5\) km per second.

(b) How will this affect your answer to part (a)?

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