A thief is noticed by a policeman from a distance of 200 m. The thief starts running and the policeman chases him. The thief and the policeman run at the rate of 10 km and 11 km per hour respectively. What is the distance between them after 6 minutes?
A
220 m
B
195 m
C
180 m
D
100 m
উত্তরের বিবরণ
Question: A thief is noticed by a policeman from a distance of 200 m. The thief starts running and the policeman chases him. The thief and the policeman run at the rate of 10 km and 11 km per hour respectively. What is the distance between them after 6 minutes?
Solution:
Relative speed of the thief and policeman = (11 - 10) km/hr = 1 km/hr
Distance covered in 6 minutes = (1/60) × 6 km = 1/10 km = 100 m
Therefore, Distance between the thief and policeman = (200 - 100) m = 100 m.
0
Updated: 6 hours ago
লিভারের ভারসাম্য বজায় রাখতে চিহ্নিত প্রশ্নবোধক স্থানের দূরত্ব কত হওয়া উচিত?
Created: 1 week ago
A
5 ফুট
B
6 ফুট
C
9 ফুট
D
10 ফুট
মানসিক দক্ষতা
মানসিক দক্ষতা (Mental skills)
সময়, দূরত্ব ও গতিবেগ (Time, distance & speed)
সীমা চিহ্নিতকরণ রেখা ও অক্ষরেখা
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প্রশ্ন: লিভারের ভারসাম্য বজায় রাখতে চিহ্নিত প্রশ্নবোধক স্থানের দূরত্ব কত হওয়া উচিত?
সমাধান:
ধরি,
A প্রান্ত ও ফালক্রামের মধ্যবর্তী দূরত্ব = x ফুট
প্রশ্নমতে,
10x = 15 × 6
⇒ 10x = 90
⇒ x = 90/10
⇒ x = 9
0
Updated: 1 week ago
The ratio between the speeds of a bus and bike is 5 : 8. If the bus travels 120 km in 2 hours, find the speed of the bike.
Created: 6 hours ago
A
88 km/h
B
86 km/h
C
96 km/h
D
98 km/h
Question: The ratio between the speeds of a bus and bike is 5 : 8. If the bus travels 120 km in 2 hours, find the speed of the bike.
Solution:
Let,
the speed of bus and bike is 5x and 8x.
Speed of bus = 120/2
= 60 km/h
ATQ,
5x = 60
⇒ x= 60/5
∴ x = 12
Speed of bike = 8x = (8 × 12) = 96 km/h
0
Updated: 6 hours ago
Speed of a boat in standing water is 18 kmph and the speed of the stream is 3 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is-
Created: 6 hours ago
A
12 hour
B
18 hour
C
20 hour
D
8 hour
Question: Speed of a boat in standing water is 18 kmph and the speed of the stream is 3 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is-
Solution:
Given,
Speed of a boat in standing water = 18 kmph
The speed of the stream = 3 kmph
∴ Speed upstream = (18 - 3) kmph
= 15 kmph.
∴ Speed downstream = (18 + 3) kmph
= 21 kmph.
So, Total time taken = (105/15 ) + (105/21) hours
= (7 + 5) hours
= 12 hour
0
Updated: 6 hours ago
