Asked by Anonymous
Kenneth and Marshall started cycling from the same starting point along a
track. Both started cycling at the same time and they did not change their
speeds throughout.
Kenneth reached the end of the track in 2 hours: Marshall covered only 4/5 of the track in that time. Given that Kenneth's
average speed was 2 km/h faster than Marshall, find the length of the track.
track. Both started cycling at the same time and they did not change their
speeds throughout.
Kenneth reached the end of the track in 2 hours: Marshall covered only 4/5 of the track in that time. Given that Kenneth's
average speed was 2 km/h faster than Marshall, find the length of the track.
Answers
Answered by
oobleck
If Kenneth's speed is k km/hr, then since distance = speed * time,
4/5 * 2k = 2(k-2)
k = 10 km/hr
and the track is 20 km
check: Marshall's speed is 10-2 = 8 km/hr
2*8 = 16 = 4/5 of the 30 km
4/5 * 2k = 2(k-2)
k = 10 km/hr
and the track is 20 km
check: Marshall's speed is 10-2 = 8 km/hr
2*8 = 16 = 4/5 of the 30 km
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