StudyClub - স্মার্ট স্টাডি প্ল্যাটফর্ম - Study Tracker - App Blocker - Reading Room

StudyClub

লগইন

থিম নির্বাচন

আপনার পছন্দের থিম বেছে নিন।

In a flight of 600 km , an aircraft was slowed down due to bad weather. Its average speed for the trip was reduced by \(200~km/hr\) and the time of flight consequently increased by 30 minutes. The duration of the flight was:

A. 1 hour

B. 1.5 hours

C. 2 hours

D. 2.5 hours

Poster Download

DUIBAমানসিক দক্ষতা(IQ)গাণিতিক সমস্যাIQ-4 (Topic Practice)DU - ⚡ অনলাইন প্রশ্নব্যাংক দেখুন 💥

Explanation: Let, speed be S and time be T. Now, \(ST=600\). Again, \((S-200)*(T+0.5)=600\). Or, \(ST - 200T + 0.5S - 100 = 600\). Or, \(200T - 0.5S + 100 = 0\). Or, \(200 T^2 + 100 T - 300 = 0\); \([S=600/T]\). Or, \(2T^2 + T - 3 = 0\). Or, \((2T+3)(T-1)=0\). Or, \(T = -3/2, 1\). So, flight টির duration ছিলো \(1 + 0.5\) hours = \(1.5\) hours.

লগইন করুন

একাউন্ট নির্বাচন করুন

গুগল একাউন্ট যুক্ত করুন

In a flight of 600 km , an aircraft was slowed down due to bad weather. Its average speed for the trip was reduced by \(200~km/hr\) and the time of flight consequently increased by 30 minutes. The duration of the flight was: