Question

Shweta when increases her speed from 25 km/hr to 30 km/hr. She takes one hour less than the usual time to cover a certain distance. What is the distance usually covered by Shweta? (in km)
A) 150 km
B) 120 km
C) 90 km
D) 180 km

Answer 1

A) 150 lcm of both 25 & 30 is 6 & 5 which means the hours

Answer 2

The correct option is A) 150 km.

Step-by-step explanation:

Consider the provided information.

Let d represents the distance.

$Time=\dfrac{Distance}{Speed}$

It is given that when she increases from 25 km/hr to 30 km/hr. She takes one hour less than the usual time to cover a certain distance.

This can be written as:

$\dfrac{d}{25}-\dfrac{d}{30}=1$

$\dfrac{6d-5d}{150}=1$

$\dfrac{d}{150}=1$

$d=150$

Hence, the correct option is A) 150 km.

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