During his holiday, Jun Wei went on a road trip from Berlin to Prague. He travelled part of the journey at a speed of 90km/h and the rest at 80km/h. Given that Jun Wei travelled a total distance of 690 km in 8 hours, form a pair of simultaneous equations to find the distance that he covered at 80km/h.
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I went to nanital this summer
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988
we should do for all plus
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