Question

A car travels 90 km in 2 1/2 hours (1) How much time is required to cover 30 km with the same speed (2) Find the distance covered in 2 hours with the same speed

Answer 1

the answer of 1 question is 3.5 hours
the answer of 2 question is 18 km

Answer 2

(a) How much time is required to cover 30 km with the same speed.

In this Case, time is unknown and distance is known.

Therefore,

We proceed as follows:

=> 2½ hours

=> 5/2 hours

=> 5/2 × 60 minutes

=> 150 minutes

• 90 km is covered in 150 minutes

Therefore,

=> 1 km can be covered in 150/90 minutes

Therefore,

=> 30 km can be covered in 150/90 × 30 minutes

=> 30 km can be covered in 50 minutes

Thus:-

• 30 km can be covered in 50 minutes.

_____________________

(b) Find the distance covered in 2 hours with the same speed.

In this case, distance is unknown and time is known.

Therefore,

We can proceed follows:

=> Distance covered in 2½ hours

=> Distance covered in 5/2 hours

=> Distance covered = 90 km

Therefore,

=> Distance covered in 2 hours = 36 × 2

=> Distance covered in 2 hours = 72 km

Thus:-

• In 2 hours, distance covered is 72 km.