Time and Distance - Quantitative Aptitude (MCQ) questions for Q. 20725

Q.  A boy has to cover a total distance of  300 kms. in 6 hours. He travels at the rate of 60 kmph. for first 90 minutes and next 100 kms. at the rate of 50 kmph. At what average speed must he travel now in order to complete the journey in 6 hours?
- Published on 07 Jul 17

a. 25 kmph.
b. 32 kmph
c. 44 kmph
d. 58 kmph

ANSWER: 44 kmph
 
The boy travels 60 kmph for 90 min, this means he travels 90 km.
Next 100 km at the rate of 50 kmph, this means he travels 100 km.
Total distance traveled till now = 100 + 90 = 190 km
Time spent = 1.5 + 2 = 3.5 hr
Required speed = Remaining distance/ Time
= (300 – 190) /(6 – 3.5)
= 110/ 2.5 = 44 kmph

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