7. A person drives a car with a speed of 60 km/hr and reaches his destination in 4 hours. If he decides to reach in 3 hours, what should be the speed?
Answers
Solution :- It is simple as we know the relation between velocity,time,and distance
Velocity=distance/time
At first given 60km/hr speed with a time of 4hrs.now find the distance
Distance=velocity×time
D=v×t=60km/hr×4hr=240km(distance)
Velocity is unknown now.
To find velocity
Velocity =distance/time
V=d/t=240km/3hr=80km/hr
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Distance = Speed x time
60 x 4 = v x 3
V= 80
Yea so it’s gonna be 80km/h
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A man drives a car and reaches his destination in 4 hours. Had he increased his speed by 10 km/hr, he would have reached it in 3 hr, 12 minutes. What distance did the man cover?
A bus traveling at 42 km per hour covers a distance in 5 hour. How much time would it save if it increased its speed by 8 km per hour?
The answer is 80km/hr
Distance = speed × time
D=60 ×4
D=240
In 3 hrs
240=vt
240=3v
V=240÷3
V=80km/hr
At first should be finding a distance which covered by car till destination than reverse process for find a speed for that particular distance
Useing ( speed = distance / time).
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The Original Speed is 60 km/h, Time = 4 hours, Distance is 240 km.
Distance is 240 km, Revised Time = 3 hours, Revised Speed = 80 km/h
As speed =distance /time
Distance = speed × time
As distance remains same in both cases..
60 ×4 = v × 3
v = 80 km / hr