Question

Ramesh could run a 100-m race in 20 seconds. After training, he can finish the race in 15 seconds. By how much has he improved his speed?

Answer 1

Ramesh's speed before training = $d/t$

=$\frac{100}{20}=5m/s$

Ramesh's speed after training = $d/t$

=$\frac{100}{15}=6.66m/s$

So, his speed increased by = $6.66-5=1.66$ m/s