Jane and sali cucled along the same 63 km route. jane took 3.5 hours to cycle the 63km. sali started to cycle 4 minutes after jane started to cycle. sali caught up with jane when they both cycled 30km jane and sali both cycled at constant speeds. work out the speed in m/s

We know that

speed=distance/time
Jane speed is > 63 km/3.5 hours> 18 Km/hours

1 Km is equals to> 1000 m
1 hour is equals to> 3600 sec
so
18 Km/hour> 18*1000/3600> 5 m/sec

for distance =30 Km
 Jane s time=?
time=distance/speed> time=30000/5> time=6000 sec> 100 min

the time it took Sali to reach 30 km was> 100 min-4 min---> 96 min
Sali speed is---> 30000/96 min--> 312.5 m/min> 312.5/60---> 5.21 m/sec

the answer is
Jane speed is 5 m/sec
Sali speed is 5.21 m/sec

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