A man walks for 5 km/hr for 1 km and 7 km/hr for next 1 km. What is his average speed for the walk of 2 km?
-5.8 km/hr
-6.0 km/hr
-2.0 km/hr
-1.0 km/hr
Thank you very much!!
2 answers
Btw the answers I gave above are positive values, not negative values. Sorry for any confusion.
d1 = V1*t1 = 1 km.
t1 = 1/V1 = 1/5 = 0.20 h.
t2 = 1/V2 = 1/7 = 0.143 s.
V=d/(t1+t2)=2km/(0.20+0.143)h=5.8 km/h.
t1 = 1/V1 = 1/5 = 0.20 h.
t2 = 1/V2 = 1/7 = 0.143 s.
V=d/(t1+t2)=2km/(0.20+0.143)h=5.8 km/h.
3 answers