A man walks at a certain speed and reaches his destination which is 6 km in 1 hr 40 minutes. If he runs the same distance in 1hr 20 minutes what is the difference in speed ?
a) 1 km / hr
b) 0.9 km / hr
c) 1.5 km / hr
d) 1.9 km / hr
**** please solve this question as a short cut method for competitive exam .
Answers
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Step-by-step explanation:
Time taken by man in first destination=1hr 40minutes
Distance=6km
Speed =D/T
S=6km/5/3
18/5=3.6km/hr
Then time taken by man in second destination=1hr 20minutes
D =6km
S =D/T
6km/4/3hr
9/2=4.5km/hr
Difference in speed =4.6-3.6=1km/hr
So, option a is correct
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