two person start from the opposite ends of a 90 km straight track and run to and from between the two ends.The speeds of first person is 30m per second and the speed of other is 125 per 6 m per second. they continue the motion for 10 hours. how many times they pass each other
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Given:
Two person start from the opposite ends of a 90 km straight track and run to and from between the two ends.
To find:
How many times they pass each other
Solution:
From given, we have,
The speed of first-person is 30m per second
Speed of first person = 30 × 18/5 = 108 km/hr
And the speed of the other is 125 per 6 m per second.
Speed of second person = 125/6 × 18/5 = 75 km/hr
Distance = Speed × Time
They continue the motion for 10 hours.
Distance covered by first person = 108 × 10 = 1080 km
Distance covered by second person = 75 × 10 = 750 km
Rounds completed by first person = 1080km/90km = 12 rounds
Therefore, both the persons meet 12 times.
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