Question

Seema goes to school everday with her cycle. Her speed is 15 m/sec. for 10 min, 25 m/sec for 20 min. and 10 min/sec for next 20 min. What is the average speed of Seema's journey to school ?​

Answer 1

Answer:

17m/s

Explanation:

speed1=15m/s

time1=10min

speed2=25m/s

time2=20min

speed3=10m/s

time3=20m/s

speed=distance/time

distance=speed x time

d1=s1xt1.

d1=15×10

d1 =150m.

d2=s2×t2

=25×20

d2=500.

d3=s3×t3

= 10×20

d3=200.

average speed=d1+d2+d3/t1+t2+t3

a.s =150+500+200/10+20+20

=850/50

=17.

so average speed is 17m/s