Math, asked by subhadipbharari74, 7 months ago

15. A person completes 30 km of a journey at 6 km/hr and the remaining 60 km in 7 hours. Find his average speed
the whole journey.
a) 9 km/hr
b) 10 km/hr.
c) 8.4 km/hr
d) 7.5 km/hr.​

Answers

Answered by Anonymous
1

Answer:

d) 7.5 kmph

Step-by-step explanation:

The person covers 30 km at the speed of = 6kmph .

Hence the time taken to cover 30 km =

= distance /speed

= 30 km / 6kmph = 5 hours

He covers first 30 km in 5 hours .

He covers remaining 60 km in 7 hours .

Total distance covered = 30km + 60km

= 90km

Total time taken to cover = 5hours + 7hours

= 12 hours

Average speed = Total distance / Total time

= 90km / 12 hours

= 7.5 kmph

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