Because, in order to get the speed, you must divide the distance by time, like in number 1, 640 (km) ÷ 10 (hrs.) is 64 (km). simply copy the time, whether hours, minutes, seconds, etc.
As for number 2 in B., I got the 18km/hr since,
5(m) / 1 (second)
5m · 60(secs for min) · 60(mins for hr) ÷ 1000 / 1 (converted to hr)
300m · 60 ÷ 1000 / 1 hr
18000m ÷ 1000(to convert to km) / 1 hr
18km/1hr
If you don't get me, i'm sorry, I tried my best. ☺
Answers & Comments
Answer:
A.
1. 64km/hr
2. 77.77km/hr or simply, 78km/hr
3. 87km/hr
B.
1. 400km/hr
2. 5m/sec or 18km/hr
Why?
Because, in order to get the speed, you must divide the distance by time, like in number 1, 640 (km) ÷ 10 (hrs.) is 64 (km). simply copy the time, whether hours, minutes, seconds, etc.
As for number 2 in B., I got the 18km/hr since,
5(m) / 1 (second)
5m · 60(secs for min) · 60(mins for hr) ÷ 1000 / 1 (converted to hr)
300m · 60 ÷ 1000 / 1 hr
18000m ÷ 1000(to convert to km) / 1 hr
18km/1hr
If you don't get me, i'm sorry, I tried my best. ☺
Hope it helps. ☺