Question

A presion can
complete his journy in 9km if the half the journy at the rate of 4km / h and the nest half journy at the speed 5 km/h l; what was the total journy ?​

Answer 1

(some corrections in question)

Question : A person can complete his 9 km journey. If half the journey at the rate of 4 km/hr and the next half journey at the speed of 5 km/hr, How long did the total journey take ?

Solution :

According to question,

• Total journey = 9 km

speed of first half journey is 4 km/hr

• Half of journey = ½ * total journey
• Half of journey = ½ * 9
• Half of journey = 4.5 km

To find time taken by person in first half journey,

Now we use formula of speed,

⟹ speed = half journey/time taken

⟹ 4 = 4.5/time taken

⟹ time taken = 4.5/4

⟹ time taken = 1.125 hour

Hence time taken in first half journey by person is 1.125 hour

similarly, for second half journey,

speed of second half journey is 5 km/hr

⟹ speed = half journey/time taken

⟹ 5 = 4.5/time taken

⟹ time taken = 4.5/5

⟹ time taken = 0.9 hour

Hence time taken in second half journey by person is 0.9 hour.

Now,

⟹ Total time taken in total journey = time taken in first half journey + time taken in second half journey

⟹ Total time taken in total journey = 1.125 + 0.9

⟹ Total time taken in total journey = 2.025 hour

Answer : Time taken by person in total journey is 2.025 hour.

{ More Info :

• 2.025 hour = 2.025 * 60 = 121.5 minutes
• 2.025 hour = 2.025 * 3600 = 7290 seconds }

Hence, time taken by person in total journey is 7290 seconds.

Answer 2

he complete his half journey (4.5km) in 4km/hr. speed we have speed=distance/time

4=4.5/time

time=4.5/4

time=1.125 hour

he complete his last half journey in 5km /hr.

speed=distance/time

5=4.5/time

time=4.5/5

time=0.9

so,total time is 1.125+0.9

=2.025 hours

hope it helps u dear ☺️☺️☺️