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# Edexcel June 06 Q7 M1 - not sure what to do Watch

1. Hey guys,

For c) to find R, I simply added the vector for the original position vector to the vector of constant velocity*300 (since 1500-1200=300). But according to the mark scheme I should *3?

Why?

The units for t are not given, and it sounds strange to use 1200 hours, but I can't see where 3 is coming from!

Thanks
2. (Original post by Serine)
Hey guys,

For c) to find R, I simply added the vector for the original position vector to the vector of constant velocity*300 (since 1500-1200=300). But according to the mark scheme I should *3?

Why?

The units for t are not given, and it sounds strange to use 1200 hours, but I can't see where 3 is coming from!

Thanks
The velocity is in kilometres per hour.

Have you heard of military time?

1200 is noon

1300 is one o'clock

1400 is two o'clock

1500 is 3 o'clock

So since you have three hours between 1200 and 1500, and your velocity is in kilometres per hour, you multiply that by 3.
3. Thanks for the clarification! What a silly mistake 🙈
4. (Original post by Serine)
Thanks for the clarification! What a silly mistake 🙈
No worries. :-)

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