Question

in a 1200 kilometre journey A man driving speed was 60 kilometre per hour for the least one upon fourth of the journey if he completed his journey is in 17 hours find the his driving speed for the first three fourth or the journey ​

Answer 1

Answer:

speed for the first 3/4 of the journey is

75km/hr

Step-by-step explanation:

his driving speed last 1/4 of the

journey = 60km

i.e the distance =1/4×1200=300km

speed = 60km/hr

so time = distance speed

= 300/60 = 5hr

total time taken = 17 hours

so time taken for first 3/4 of the journey

= 7 - 5

= 12 hours

Now, for the first 3/4 of the journey

time =12 hours

so speed = distance / time = 900/12

= 75 km/hr