Prajay cycled 100 m in 20 seconds. At this rate how long will it take him to go 1 km? What is his speed in km/h? What distance will he cover in 40 minutes?
Answers
Answer:
18 km
Explanation:
Speed is defined as distance traveled per unit time. Since Prashant cycled 100m in 20 seconds, the distance he traveled is 100 m and the elapsed time is 20 seconds. His speed = 100 m / 20 s which can be expressed as 5 m/s. To convert this speed to km/h just multiply both the numerator and denominator by 3600. So 5 m/s times (3600 / 3600) gives (5 * 3600 m) /3600 s. When simplified it is 18,000 m / 3,600 s or 18 km / h.
Answer:
for 1 km = 200 secs or 3 mins 20 secs
speed = 18 Km/ h
in 40 mins he cover 12km or 12000 m
Explanation:
if 100m in 20 secs
then in 1 sec he covers 100/20m
= 5m
in 1 minute he covers
= 5 x 60 = 300m or 0.3km
so his speed will be km/h
0.3 x 60 = 18 km /h
in 40 mins he covers
300 x 40 = 12000 m or 12 Km