Aptitude - Time and Distance - Discussion
Discussion Forum : Time and Distance - General Questions (Q.No. 2)
2.
An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in 1
hours, it must travel at a speed of:
hours, it must travel at a speed of:Answer: Option
Explanation:
Distance = (240 x 5) = 1200 km.
Speed = Distance/Time
Speed = 1200/(5/3) km/hr. [We can write 1 hours as 5/3 hours]
 Required speed = |
 |
1200 x | 3 |  km/hr |
= 720 km/hr. |
| 5 |
Discussion:
160 comments Page 5 of 16.
Vaibhav said:
1 decade ago
When distance is same. At that time use the following formula.
v1t1= v2t2.
We have:
v1=240.
t1=5.
t2=5/3.
Therefore we easily find out v2 =720.
v1t1= v2t2.
We have:
v1=240.
t1=5.
t2=5/3.
Therefore we easily find out v2 =720.
Velu said:
9 years ago
Speed ---- time
240 ---- 5
x ---- 5/3...
In direct proposal.
240 * 5 * 3
----------------
5
= 740 km/hr.
240 ---- 5
x ---- 5/3...
In direct proposal.
240 * 5 * 3
----------------
5
= 740 km/hr.
Sree said:
1 decade ago
Hello! Shwetha, You want to take it as comparison of two plan.
First Plan : 240km * 5hr = 1200km/hr
Second Plan: ? *1+(2/3)= 1200km/hr
First Plan : 240km * 5hr = 1200km/hr
Second Plan: ? *1+(2/3)= 1200km/hr
JEEVA said:
1 decade ago
240km--------5hr.
? --------5/3hr.
240*5/5/3 the 5/3 become 3/5 when it come up, the 5 can cut.
So finally we can 240*3 = 720kmph.
? --------5/3hr.
240*5/5/3 the 5/3 become 3/5 when it come up, the 5 can cut.
So finally we can 240*3 = 720kmph.
Dilip said:
1 decade ago
Those who says Answer as 720 please read the question. Its given that speed for a time of 1Hr should be foun out, not for 1+ (2/3) hrs.
Sudha said:
8 years ago
Speed=distance÷time.
So, we substuite those values.
S = 1200/5/3.but why should change 5/3 as3/5.please tell me, I get confused.
So, we substuite those values.
S = 1200/5/3.but why should change 5/3 as3/5.please tell me, I get confused.
Vaishnavi Kasana said:
2 years ago
In question it's given in mixed fraction, therefore it will be converted into fraction i.e 5/3 hrs.
(3*1)+2=5.
Fraction = 5/3hrs.
(3*1)+2=5.
Fraction = 5/3hrs.
(10)
Darshan said:
1 decade ago
Aeroplane travels total of 1200km to cover same distance in 1 hour it should travel wit 1200 kmph right but how come 720 kmph ?
Penny said:
1 decade ago
Either the options are incorrect or there is something seriously wrong with my basics.
How could 1 hour be written as 5/3?:-o.
How could 1 hour be written as 5/3?:-o.
Kiran chavan said:
7 years ago
Keep it simple.
The distance = speed * time.
Therefore let speed be x now compare.
240*5=5/3*x.
240*5*3=5*x.
x=240*3.
x=720.
The distance = speed * time.
Therefore let speed be x now compare.
240*5=5/3*x.
240*5*3=5*x.
x=240*3.
x=720.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers