Two persons start from same place in opposite directions. One goes towards north at 18km/hr and the other towards south at 20km/hr. What time will they take to be 57km apart?
Answers
Answer:
After one and half hours they will be 57km apart.
Given:
Two persons start from same place in opposite directions. One goes towards north at 18km/hr and the other towards south at 20km/hr
To find:
Time will they take to be 57km apart.
Step-by-step explanation:
Hint:
speed = distance / time
distance = Speed × time
Let us consider after T hours they will be 57 km apart.
It is given that,
Two persons start from same place in opposite directions and
→ one goes towards north at 18km/hr
so, distance traveled by him in T hours
⇒ 18 × T
⇒ 18T
→ one goes towards north at 18km/hr
so, distance traveled by him in T hours
⇒ 20 × T
⇒ 20T
As they travel in opposite direction, distance between them after T hours will be :
⇒ 18T + 20T
⇒ 38T
which must be equal to 57 km
∴ 38T = 57
⇒ T = 57/38
⇒ T = 1.5
Hence, after 1 and half hour they will be 57km apart.
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