Sunday

February 1, 2015

February 1, 2015

Posted by **aleeza** on Saturday, June 25, 2011 at 11:16am.

- physics -
**drwls**, Saturday, June 25, 2011 at 12:23pmYou must mean that the rate of walking to school is 6 km/h, not 6 km.

Let the distance to school be D. (It will cancel out when you compute the avg. speed)

avg speed = (total distance covered)/(total time)

= 2D/[D/6 + D/2.5}

= 2/[(1/6 + 4/10]

= 2/[5/30 + 12/30]

= 60/17 = 3.53 km/h

Note that this is NOT the average of 6 and 2.5. He spends more time walking at the lower speed.

**Answer this Question**

**Related Questions**

physics - a boy walks to his school at a distance of 6km with constant speed of ...

physics - a boy walks to his school at a distance of 6km with constant speed of ...

math - if someone walks 5km in 21 minutes and then 4 km in 39 minutes then whats...

science - Thank you so much, Ms. Sue. Is this correct? A family backpacking at ...

math - Da Ming walks from his school to his house at a speed of 5km/h.he takes ...

physics - vicky walks 8km east, the 5km south and final 6km west. find her final...

maths - sita and gita start walking from the same point on the road but in ...

maths-Linear equation - sita and gita start walking from the same point on the ...

physics - A person walks first at a constant speed of 4.90 m/s along a straight ...

physics - A person walks first at a constant speed of 4.90 m/s along a straight ...