Question

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40. A man walks with speed 15 km/hr instead of 12 km/h
and covers 20 km more distance. Find the distance
covered by him with speed 15 km/hr.
- A. 50 km
B. 60 km
c. 70 km
D. None of these
'
*​

Answer 1

Option D. None of these

Step-by-step explanation:

A man walks with the speed 15 km/hr instead of 12 km/hr.

Let the actual distance covered by the man be 'd'

$speed=\frac{distance}{time}$

He walks d km at the speed of 12 km/hr, and he walks 20 km more distance at the speed of 15 km/hr.

So,

⇒  $\frac{d}{12}=\frac{d+20}{15}$

15d = 12(d + 20)

15d = 12d + 240

3d = 240

d = 80 km

He walks with speed of 15 km/hr = 80 + 20 = 100 km

Man covered 100 km with speed of 15 km/hr.

Learn more a different method to solve the problem : https://brainly.in/question/5191455