A man takes 30 minutes to cover a certain distance at the speed of 3 km/hr . By how much should he increase his speed to cover the distance in 20 minutes?
Answers
Answered by
2
Answer:
1.5 speed increase
Explanation:
(3+x)×20=3×30
60+20x=90
20x=30
x=1.5
Answered by
0
Answer:
the distance covered in 30 min =1/2h at the speed of 3km/h is
D=S×T =3km/h ×1/2h =3/2km
the required speed to cover 3/2km in 20 min =1/3h is
T=D/S 3/2km /1/3h=
3×3/1×2=9/2=4.5km/h
4.5-3 = 1.5 km/h
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