Question

A jogger is running at a speed of 15 km/hr. In what time he will cross a track of length 400 meters?​

Answer 1

Step-by-step explanation:

Given that jogger runs 15km/hr….

As we know that…

1 km/hr = 5/18 meter/sec

( 1 km=1000 meter,

1 hr=60×60 sec,

Then

1 km/hr = 1000/3600

=5/18 )

Answer 2

Answer:

Given that jogger runs 15km/hr….

As we know that…

1 km/hr = 5/18 meter/sec

( 1 km=1000 meter,

1 hr=60×60 sec,

Then,

1 km/hr = 1000/3600

=5/18 )

So,

15 km/hr =15×5/18 m/s

Let jogger takes 'X' sec to complete 400 m.

Then,

X×(15×5/18)=400

X×(15×5)=400×18

X=400×18/(15×5)

X=96 sec.

Hence the jogger takes 96 sec to complete 400 meter length track.