Question

2. Acar travels 90 kilometre in in 2 1/2 hours
a) how much time is required to cover 30 km with the same speed?
b) Find the distance covered in 2 hours with the same speed.​

Answer 1

Answer:

It is given that , Pranali and Prasad have same speed.

Thus, they cover same distance in 2 hours .

i.e. OA=OB

By pythagoras theorem ,

In△AOB

AB

2

=AO

2

+OB

2

⇒(15

2

)

2

=AO

2

+OA

2

⇒450=2AO

2

⇒AO

2

=

2

450

⇒AO

2

=225

⇒AO=15km

⇒BO=15km

⇒Speed=

Time

Distance

=

2

15

=7.5km per hour