A company that makes hair-care products had 2,000 people try a new shampoo. Of the 2,000 people, 4 had a mild allergic reaction.
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Answer:
Malory will catch up with Dori in 25 minutes.
Step-by-step explanation:
Given:-
Dori walking at 50 steps/min.
Malory walking at 90 steps/min.
Now, as Dori left the house 20 mins ahead of Malory and
Dori is walking at speed of 50 steps/min, that means
Dori is walking ahead of Malory by 50 (steps) 20 (minutes)
Dori is walking ahead of Malory by 50 20
Dori is walking ahead of Malory by = 1000 steps
Now, let time be t of walking by Dori and Malory,
to calculate the time for Malory to catch up with Dori can be written as,
where, 1000 is the headstart for Dori, 50 and 90 is the walking speed of Dori and Malory respectively in steps/ min.
Therefore Malory will catch up with Dori in 25 minutes.