Question

25.
A person has to cover a distance of
q 6 km in 45 min. If he covers one half
of the distance in two-third of the
total time then to cover the
remaining distance in the
remaining time, his speed must be-
(1) 6 km/hr (2) 8 km /hr
(3) 12 km /hr (4) 15 km/hr​

Answer 1

Answer:

(3) 12 km / hr

Step-by-step explanation:

sol1

The person needs to cover

6

km in

45

minutes

Given that he covers one-half of the distance in two-thirds of the total time

⇒

he covers half of

6

km in two-thirds of

45

minutes

⇒

He covers

3

km in

30

minutes

Now he needs to cover the remaining

3

km in remaining

15

minutes

Distance

=

3

km

Time

=

15

minutes

=

1

4

hour

Required Speed

=

3

(

1

4

)

=

12

km/hr

sol2

He needs to cover remaining half distance in remaining one-third of the total time.

i.e.,

3

km in

15

minutes.

i.e.,

12

km in

1

hour.

Therefore, required speed

=

12

km/hr