A teacher driving his vehicle at 24 kmph, reaches her school 5 minutes late. If she had driven the vehicle 25% faster on an average she would have reached 4 minutes earlier than the scheduled time. How far is her school ?
A72 km
B36 km
C48 km
D18 km
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ഒരു കാര് ഒരു യാത്രയ്ക്കെടുത്ത സമയം 2 മണിക്കൂറാണ്. യാത്ര ചെയ്ത സമയത്തിന്റെ ആദ്യത്തെ 5⁄12 ഭാഗം 30 കി.മീ/മണിക്കൂര് വേഗതയിലും ശേഷിക്കുന്നത് 42 കി.മീ/മണിക്കൂർ വേഗതയിലുമാണ് സഞ്ചരിച്ചത്. എങ്കിൽ ആകെ യാത്ര ചെയ്ത ദൂരം എത്ര?
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.