Question

Raj enters a 100 m race 5 seconds after Rahul ran. If Raj finishes the race at the same time as Rahul who ran at 4 m/s, at what speed did Raj run the race? [3 MARKS]

Answer 1

Steps: 2 Marks
Result: 1 Mark

Distance covered by Rahul at 4 m/s = 100 m
Time taken to cover this distance = 25 seconds.

Raj started five seconds later but finishes at the same time.
Hence, time taken by Raj to finish the race = 20 seconds
Distance covered by Raj = 100 m
Speed at which Raj ran $=\frac{Distance}{time}$
$=\frac{100}{20}$
= 5 m/s