Question

a certain distance in 4 hours 20 minutes at an average speed of 60 km/h. How long wil
co the same distance at a speed of 40 km/hr?​

Answer 1

Step-by-step explanation:

Time taken= 4 hours 20 minutes =( 4 + 1/3 ) hour

= (12+1)/3 hour

= 13/3 hour

Distance = 60* 13/3 = 260 km

if speed = 40 km/ hour

Then, required time taken= 260/40 hr

= 26/4 hr

= 13 /2 hr

= 6+1/2 hr

= 6 hr 30 min

Answer 2

Step-by-step explanation:

i> 60 km in 1 hour

in 4h 20min = 60 x 4 | 60 x 1 / 3 = 20km

240km + 20km

260km. in 4h 20m

ii> 40km in 1h

in 4h 20m = 40 x 4 || 40 x 1 / 3 = 40 / 3

= 160km + 40 /3

480 40

------- + ----

3 3

520

--------

3

_

= 173.3km