# Exam-Style Question on Standard Form

## A mathematics exam-style question with a worked solution that can be revealed gradually

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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.

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