Challenger App

No.1 PSC Learning App

1M+ Downloads
A and B are two cities. A man travels from A to B at a speed of 10 km/hr. and returns back at the speed of 30 km/hr. Find his average speed for whole journey.

A12 km/hr

B15 km/hr

C20 km/hr

D22.5 km/hr

Answer:

B. 15 km/hr

Read Explanation:

ശരാശരി വേഗത =(2 × 10 × 30)/(10+30) =600/40 =15


Related Questions:

Two stations P and Q are 110 km apart on a straight track. One train starts from P at 7 a.m. and travels towards Q at 20 kmph. Another train starts from Q at 8 a.m. and travels towards P at a speed of 25 kmph. At what time will they meet?
A man walks at a speed of 8 km / h. After every kilometre, he takes a rest for 4 minutes. How much time will he take to cover a distance of 6 km?
50 km/hr വേഗത്തിൽ സഞ്ചരിക്കുന്ന കാർ A യിൽ നിന്നും B യിലെത്താൻ 3 മണിക്കൂർ 15 മിനിറ്റ് എടുത്താൽ A യും B യും തമ്മിലുള്ള അകലം.
Two men P and Q start from a place walking at 5 km per hour and 6.5 km per hour respectively. What is the time they will take to be 92 km apart if they walk in opposite directions?
ഒരാൾ 75 km/hr വേഗത്തിൽ കാറോടിക്കുന്നു. എങ്കിൽ 50 മിനിട്ടിൽ അയാൾ സഞ്ചരിച്ച ദൂരം എത്ര?