Question

It takes Hank 6 hours to drive a certain distance at an average speed of 80km/h. How long does it take Hank to drive the same distance at an average speed of 160km/h? *

Answer 1

Answer:

Step-by-step explanation:

Correct option is C)

Let the each half of the running time be t.

During first half time, speed of car is 80 km/h

Distance covered  d

1

​

=80t km

During second half time, speed of car is 40 km/h

Distance covered  d

2

​

=40t km

Total distance covered  d=d

1

​

+d

2

​

=80t+40t=120t

Total time taken   T=2t

Average speed   v

avg

​

=

T

d

​

=

2t

120t

​

=60 km/hr

Answer 2

Answer:

3hrs

Step-by-step explanation:

this is an example of inverse proportion

so for 80km/hr it was 6hrs

so for 160km/hr:

80*2=160

now we do the same thing with the hours but since its inverse proportion we divide 2 instead of multiplying

so:

6/2= 3

so therefore it takes hime 3 hrs